Finding the Fourth Proportional to 56,640.76, 78,166.20 and 31,148.16

Step by Step Solution

1. Step 1: Write the proportion equation
   56,640.76 : 78,166.20 = 31,148.16 : x
2. Step 2: Convert to fraction form
   56,640.76/78,166.20 = 31,148.16/x
3. Step 3: Cross multiply
   56,640.76x = 78,166.20 × 31,148.16
4. Step 4: Simplify right side
   56,640.76x = 2,434,733,304.19
5. Step 5: Solve for x
   x = 2,434,733,304.19/56,640.76
6. Step 6: Final answer
   x = 42,985.53