Finding the Fourth Proportional to 85,307.31, 127,789.68 and 42,483.72

Step by Step Solution

1. Step 1: Write the proportion equation
   85,307.31 : 127,789.68 = 42,483.72 : x
2. Step 2: Convert to fraction form
   85,307.31/127,789.68 = 42,483.72/x
3. Step 3: Cross multiply
   85,307.31x = 127,789.68 × 42,483.72
4. Step 4: Simplify right side
   85,307.31x = 5,428,981,622.53
5. Step 5: Solve for x
   x = 5,428,981,622.53/85,307.31
6. Step 6: Final answer
   x = 63,640.29