Finding the Fourth Proportional to 142,398.24, 196,506.72 and 78,734.40

Step by Step Solution

1. Step 1: Write the proportion equation
   142,398.24 : 196,506.72 = 78,734.40 : x
2. Step 2: Convert to fraction form
   142,398.24/196,506.72 = 78,734.40/x
3. Step 3: Cross multiply
   142,398.24x = 196,506.72 × 78,734.40
4. Step 4: Simplify right side
   142,398.24x = 15,471,838,695.17
5. Step 5: Solve for x
   x = 15,471,838,695.17/142,398.24
6. Step 6: Final answer
   x = 108,651.90