Finding the Fourth Proportional to 139,839.90, 209,597.10 and 79,910.37

Step by Step Solution

1. Step 1: Write the proportion equation
   139,839.90 : 209,597.10 = 79,910.37 : x
2. Step 2: Convert to fraction form
   139,839.90/209,597.10 = 79,910.37/x
3. Step 3: Cross multiply
   139,839.90x = 209,597.10 × 79,910.37
4. Step 4: Simplify right side
   139,839.90x = 16,748,981,811.93
5. Step 5: Solve for x
   x = 16,748,981,811.93/139,839.90
6. Step 6: Final answer
   x = 119,772.55