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Finding the Fourth Proportional to 260,996,978.34, 391,411,731.20 and 86,080,685.40

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Solution

The fourth proportional to 260,996,978.34, 391,411,731.20 and 86,080,685.40 is: 129,093,410.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,996,978.34 : 391,411,731.20 = 86,080,685.40 : x
  2. Step 2: Convert to fraction form
    260,996,978.34/391,411,731.20 = 86,080,685.40/x
  3. Step 3: Cross multiply
    260,996,978.34x = 391,411,731.20 × 86,080,685.40
  4. Step 4: Simplify right side
    260,996,978.34x = 33,692,990,094,866,164
  5. Step 5: Solve for x
    x = 33,692,990,094,866,164/260,996,978.34
  6. Step 6: Final answer
    x = 129,093,410.62

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