Finding the Fourth Proportional to 78,603.16, 108,287.92 and 54,688.72

Step by Step Solution

1. Step 1: Write the proportion equation
   78,603.16 : 108,287.92 = 54,688.72 : x
2. Step 2: Convert to fraction form
   78,603.16/108,287.92 = 54,688.72/x
3. Step 3: Cross multiply
   78,603.16x = 108,287.92 × 54,688.72
4. Step 4: Simplify right side
   78,603.16x = 5,922,127,736.26
5. Step 5: Solve for x
   x = 5,922,127,736.26/78,603.16
6. Step 6: Final answer
   x = 75,342.11