Finding the Fourth Proportional to 142,387.72, 196,480.02 and 78,715.24

Step by Step Solution

1. Step 1: Write the proportion equation
   142,387.72 : 196,480.02 = 78,715.24 : x
2. Step 2: Convert to fraction form
   142,387.72/196,480.02 = 78,715.24/x
3. Step 3: Cross multiply
   142,387.72x = 196,480.02 × 78,715.24
4. Step 4: Simplify right side
   142,387.72x = 15,465,971,929.50
5. Step 5: Solve for x
   x = 15,465,971,929.50/142,387.72
6. Step 6: Final answer
   x = 108,618.72