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Finding the Fourth Proportional to 399,666.90, 551,540.46 and 215,905.53

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Solution

The fourth proportional to 399,666.90, 551,540.46 and 215,905.53 is: 297,949.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,666.90 : 551,540.46 = 215,905.53 : x
  2. Step 2: Convert to fraction form
    399,666.90/551,540.46 = 215,905.53/x
  3. Step 3: Cross multiply
    399,666.90x = 551,540.46 × 215,905.53
  4. Step 4: Simplify right side
    399,666.90x = 119,080,635,332.74
  5. Step 5: Solve for x
    x = 119,080,635,332.74/399,666.90
  6. Step 6: Final answer
    x = 297,949.71

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