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Finding the Fourth Proportional to 256,872.70, 385,309.05 and 90,639.10

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Solution

The fourth proportional to 256,872.70, 385,309.05 and 90,639.10 is: 135,958.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,872.70 : 385,309.05 = 90,639.10 : x
  2. Step 2: Convert to fraction form
    256,872.70/385,309.05 = 90,639.10/x
  3. Step 3: Cross multiply
    256,872.70x = 385,309.05 × 90,639.10
  4. Step 4: Simplify right side
    256,872.70x = 34,924,065,513.86
  5. Step 5: Solve for x
    x = 34,924,065,513.86/256,872.70
  6. Step 6: Final answer
    x = 135,958.65

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