Finding the Fourth Proportional to 139,552.40, 209,377.20 and 60,723.20

Step by Step Solution

1. Step 1: Write the proportion equation
   139,552.40 : 209,377.20 = 60,723.20 : x
2. Step 2: Convert to fraction form
   139,552.40/209,377.20 = 60,723.20/x
3. Step 3: Cross multiply
   139,552.40x = 209,377.20 × 60,723.20
4. Step 4: Simplify right side
   139,552.40x = 12,714,053,591.04
5. Step 5: Solve for x
   x = 12,714,053,591.04/139,552.40
6. Step 6: Final answer
   x = 91,105.95