Finding the Fourth Proportional to 139,515.20, 209,791.20 and 116,705.60

Step by Step Solution

1. Step 1: Write the proportion equation
   139,515.20 : 209,791.20 = 116,705.60 : x
2. Step 2: Convert to fraction form
   139,515.20/209,791.20 = 116,705.60/x
3. Step 3: Cross multiply
   139,515.20x = 209,791.20 × 116,705.60
4. Step 4: Simplify right side
   139,515.20x = 24,483,807,870.72
5. Step 5: Solve for x
   x = 24,483,807,870.72/139,515.20
6. Step 6: Final answer
   x = 175,492.05