Finding the Fourth Proportional to 56,730.32, 78,287.18 and 31,236.15

Step by Step Solution

1. Step 1: Write the proportion equation
   56,730.32 : 78,287.18 = 31,236.15 : x
2. Step 2: Convert to fraction form
   56,730.32/78,287.18 = 31,236.15/x
3. Step 3: Cross multiply
   56,730.32x = 78,287.18 × 31,236.15
4. Step 4: Simplify right side
   56,730.32x = 2,445,389,941.38
5. Step 5: Solve for x
   x = 2,445,389,941.38/56,730.32
6. Step 6: Final answer
   x = 43,105.52