Finding the Fourth Proportional to 139,445.57, 209,168.42 and 92,049.59

Step by Step Solution

1. Step 1: Write the proportion equation
   139,445.57 : 209,168.42 = 92,049.59 : x
2. Step 2: Convert to fraction form
   139,445.57/209,168.42 = 92,049.59/x
3. Step 3: Cross multiply
   139,445.57x = 209,168.42 × 92,049.59
4. Step 4: Simplify right side
   139,445.57x = 19,253,865,795.86
5. Step 5: Solve for x
   x = 19,253,865,795.86/139,445.57
6. Step 6: Final answer
   x = 138,074.42