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Finding the Fourth Proportional to 209,861.70, 314,869.35 and 85,215.30

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Solution

The fourth proportional to 209,861.70, 314,869.35 and 85,215.30 is: 127,854.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    209,861.70 : 314,869.35 = 85,215.30 : x
  2. Step 2: Convert to fraction form
    209,861.70/314,869.35 = 85,215.30/x
  3. Step 3: Cross multiply
    209,861.70x = 314,869.35 × 85,215.30
  4. Step 4: Simplify right side
    209,861.70x = 26,831,686,121.06
  5. Step 5: Solve for x
    x = 26,831,686,121.06/209,861.70
  6. Step 6: Final answer
    x = 127,854.13

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