Finding the Fourth Proportional to 57,152.79, 78,870.78 and 31,659.15

Step by Step Solution

1. Step 1: Write the proportion equation
   57,152.79 : 78,870.78 = 31,659.15 : x
2. Step 2: Convert to fraction form
   57,152.79/78,870.78 = 31,659.15/x
3. Step 3: Cross multiply
   57,152.79x = 78,870.78 × 31,659.15
4. Step 4: Simplify right side
   57,152.79x = 2,496,982,150.40
5. Step 5: Solve for x
   x = 2,496,982,150.40/57,152.79
6. Step 6: Final answer
   x = 43,689.59