Finding the Fourth Proportional to 78,555.46, 108,471.86 and 72,857

Step by Step Solution

1. Step 1: Write the proportion equation
   78,555.46 : 108,471.86 = 72,857 : x
2. Step 2: Convert to fraction form
   78,555.46/108,471.86 = 72,857/x
3. Step 3: Cross multiply
   78,555.46x = 108,471.86 × 72,857
4. Step 4: Simplify right side
   78,555.46x = 7,902,934,304.02
5. Step 5: Solve for x
   x = 7,902,934,304.02/78,555.46
6. Step 6: Final answer
   x = 100,603.25