Finding the Fourth Proportional to 156,089.61, 215,413.40 and 88,118.10

Step by Step Solution

1. Step 1: Write the proportion equation
   156,089.61 : 215,413.40 = 88,118.10 : x
2. Step 2: Convert to fraction form
   156,089.61/215,413.40 = 88,118.10/x
3. Step 3: Cross multiply
   156,089.61x = 215,413.40 × 88,118.10
4. Step 4: Simplify right side
   156,089.61x = 18,981,819,081.95
5. Step 5: Solve for x
   x = 18,981,819,081.95/156,089.61
6. Step 6: Final answer
   x = 121,608.47