Finding the Fourth Proportional to 57,085.02, 78,724.71 and 39,148.38

Step by Step Solution

1. Step 1: Write the proportion equation
   57,085.02 : 78,724.71 = 39,148.38 : x
2. Step 2: Convert to fraction form
   57,085.02/78,724.71 = 39,148.38/x
3. Step 3: Cross multiply
   57,085.02x = 78,724.71 × 39,148.38
4. Step 4: Simplify right side
   57,085.02x = 3,081,944,862.47
5. Step 5: Solve for x
   x = 3,081,944,862.47/57,085.02
6. Step 6: Final answer
   x = 53,988.68