Finding the Fourth Proportional to 78,602.16, 108,286.56 and 54,687.72

Step by Step Solution

1. Step 1: Write the proportion equation
   78,602.16 : 108,286.56 = 54,687.72 : x
2. Step 2: Convert to fraction form
   78,602.16/108,286.56 = 54,687.72/x
3. Step 3: Cross multiply
   78,602.16x = 108,286.56 × 54,687.72
4. Step 4: Simplify right side
   78,602.16x = 5,921,945,073.04
5. Step 5: Solve for x
   x = 5,921,945,073.04/78,602.16
6. Step 6: Final answer
   x = 75,340.74