Finding the Fourth Proportional to 111,020.92, 153,112.03 and 78,691.59

Step by Step Solution

1. Step 1: Write the proportion equation
   111,020.92 : 153,112.03 = 78,691.59 : x
2. Step 2: Convert to fraction form
   111,020.92/153,112.03 = 78,691.59/x
3. Step 3: Cross multiply
   111,020.92x = 153,112.03 × 78,691.59
4. Step 4: Simplify right side
   111,020.92x = 12,048,629,088.83
5. Step 5: Solve for x
   x = 12,048,629,088.83/111,020.92
6. Step 6: Final answer
   x = 108,525.75