Finding the Fourth Proportional to 142,396.71, 196,513.61 and 78,734.50

Step by Step Solution

1. Step 1: Write the proportion equation
   142,396.71 : 196,513.61 = 78,734.50 : x
2. Step 2: Convert to fraction form
   142,396.71/196,513.61 = 78,734.50/x
3. Step 3: Cross multiply
   142,396.71x = 196,513.61 × 78,734.50
4. Step 4: Simplify right side
   142,396.71x = 15,472,400,826.55
5. Step 5: Solve for x
   x = 15,472,400,826.55/142,396.71
6. Step 6: Final answer
   x = 108,657.01