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Finding the Fourth Proportional to 20,255.72, 27,945.07 and 12,688.88

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Solution

The fourth proportional to 20,255.72, 27,945.07 and 12,688.88 is: 17,505.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,255.72 : 27,945.07 = 12,688.88 : x
  2. Step 2: Convert to fraction form
    20,255.72/27,945.07 = 12,688.88/x
  3. Step 3: Cross multiply
    20,255.72x = 27,945.07 × 12,688.88
  4. Step 4: Simplify right side
    20,255.72x = 354,591,468.37
  5. Step 5: Solve for x
    x = 354,591,468.37/20,255.72
  6. Step 6: Final answer
    x = 17,505.75

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