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Finding the Fourth Proportional to 61,709.80, 85,138.74 and 40,189.72

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Solution

The fourth proportional to 61,709.80, 85,138.74 and 40,189.72 is: 55,448.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,709.80 : 85,138.74 = 40,189.72 : x
  2. Step 2: Convert to fraction form
    61,709.80/85,138.74 = 40,189.72/x
  3. Step 3: Cross multiply
    61,709.80x = 85,138.74 × 40,189.72
  4. Step 4: Simplify right side
    61,709.80x = 3,421,702,121.75
  5. Step 5: Solve for x
    x = 3,421,702,121.75/61,709.80
  6. Step 6: Final answer
    x = 55,448.28

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