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Finding the Fourth Proportional to 256,716.80, 385,140.08 and 207,246.40

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Solution

The fourth proportional to 256,716.80, 385,140.08 and 207,246.40 is: 310,921.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,716.80 : 385,140.08 = 207,246.40 : x
  2. Step 2: Convert to fraction form
    256,716.80/385,140.08 = 207,246.40/x
  3. Step 3: Cross multiply
    256,716.80x = 385,140.08 × 207,246.40
  4. Step 4: Simplify right side
    256,716.80x = 79,818,895,075.71
  5. Step 5: Solve for x
    x = 79,818,895,075.71/256,716.80
  6. Step 6: Final answer
    x = 310,921.98

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