Finding the Fourth Proportional to 139,766.24, 209,664.12 and 80,600.60

Step by Step Solution

1. Step 1: Write the proportion equation
   139,766.24 : 209,664.12 = 80,600.60 : x
2. Step 2: Convert to fraction form
   139,766.24/209,664.12 = 80,600.60/x
3. Step 3: Cross multiply
   139,766.24x = 209,664.12 × 80,600.60
4. Step 4: Simplify right side
   139,766.24x = 16,899,053,870.47
5. Step 5: Solve for x
   x = 16,899,053,870.47/139,766.24
6. Step 6: Final answer
   x = 120,909.41