Finding the Fourth Proportional to 57,128.80, 78,835.92 and 31,636.24

Step by Step Solution

1. Step 1: Write the proportion equation
   57,128.80 : 78,835.92 = 31,636.24 : x
2. Step 2: Convert to fraction form
   57,128.80/78,835.92 = 31,636.24/x
3. Step 3: Cross multiply
   57,128.80x = 78,835.92 × 31,636.24
4. Step 4: Simplify right side
   57,128.80x = 2,494,072,085.74
5. Step 5: Solve for x
   x = 2,494,072,085.74/57,128.80
6. Step 6: Final answer
   x = 43,657.00