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Finding the Fourth Proportional to 209,867.70, 314,878.35 and 85,221.30

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Solution

The fourth proportional to 209,867.70, 314,878.35 and 85,221.30 is: 127,863.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    209,867.70 : 314,878.35 = 85,221.30 : x
  2. Step 2: Convert to fraction form
    209,867.70/314,878.35 = 85,221.30/x
  3. Step 3: Cross multiply
    209,867.70x = 314,878.35 × 85,221.30
  4. Step 4: Simplify right side
    209,867.70x = 26,834,342,328.86
  5. Step 5: Solve for x
    x = 26,834,342,328.86/209,867.70
  6. Step 6: Final answer
    x = 127,863.14

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