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Finding the Fourth Proportional to 386,071.20, 579,135.60 and 136,720.80

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Solution

The fourth proportional to 386,071.20, 579,135.60 and 136,720.80 is: 205,091.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,071.20 : 579,135.60 = 136,720.80 : x
  2. Step 2: Convert to fraction form
    386,071.20/579,135.60 = 136,720.80/x
  3. Step 3: Cross multiply
    386,071.20x = 579,135.60 × 136,720.80
  4. Step 4: Simplify right side
    386,071.20x = 79,179,882,540.48
  5. Step 5: Solve for x
    x = 79,179,882,540.48/386,071.20
  6. Step 6: Final answer
    x = 205,091.40

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