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Finding the Fourth Proportional to 20,978.91, 31,460.87 and 6,936.34

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Solution

The fourth proportional to 20,978.91, 31,460.87 and 6,936.34 is: 10,402.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,978.91 : 31,460.87 = 6,936.34 : x
  2. Step 2: Convert to fraction form
    20,978.91/31,460.87 = 6,936.34/x
  3. Step 3: Cross multiply
    20,978.91x = 31,460.87 × 6,936.34
  4. Step 4: Simplify right side
    20,978.91x = 218,223,367.65
  5. Step 5: Solve for x
    x = 218,223,367.65/20,978.91
  6. Step 6: Final answer
    x = 10,402.04

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