Finding the Fourth Proportional to 139,872.60, 209,646.18 and 79,943.04

Step by Step Solution

1. Step 1: Write the proportion equation
   139,872.60 : 209,646.18 = 79,943.04 : x
2. Step 2: Convert to fraction form
   139,872.60/209,646.18 = 79,943.04/x
3. Step 3: Cross multiply
   139,872.60x = 209,646.18 × 79,943.04
4. Step 4: Simplify right side
   139,872.60x = 16,759,752,953.59
5. Step 5: Solve for x
   x = 16,759,752,953.59/139,872.60
6. Step 6: Final answer
   x = 119,821.56