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Finding the Fourth Proportional to 20,739.78, 31,081.86 and 7,579.62

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Solution

The fourth proportional to 20,739.78, 31,081.86 and 7,579.62 is: 11,359.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,739.78 : 31,081.86 = 7,579.62 : x
  2. Step 2: Convert to fraction form
    20,739.78/31,081.86 = 7,579.62/x
  3. Step 3: Cross multiply
    20,739.78x = 31,081.86 × 7,579.62
  4. Step 4: Simplify right side
    20,739.78x = 235,588,687.69
  5. Step 5: Solve for x
    x = 235,588,687.69/20,739.78
  6. Step 6: Final answer
    x = 11,359.27

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