Finding the Fourth Proportional to 57,185.59, 78,915.15 and 31,691.87

Step by Step Solution

1. Step 1: Write the proportion equation
   57,185.59 : 78,915.15 = 31,691.87 : x
2. Step 2: Convert to fraction form
   57,185.59/78,915.15 = 31,691.87/x
3. Step 3: Cross multiply
   57,185.59x = 78,915.15 × 31,691.87
4. Step 4: Simplify right side
   57,185.59x = 2,500,968,280.25
5. Step 5: Solve for x
   x = 2,500,968,280.25/57,185.59
6. Step 6: Final answer
   x = 43,734.24