Finding the Fourth Proportional to 142,168.86, 196,191.80 and 78,505.29

Step by Step Solution

1. Step 1: Write the proportion equation
   142,168.86 : 196,191.80 = 78,505.29 : x
2. Step 2: Convert to fraction form
   142,168.86/196,191.80 = 78,505.29/x
3. Step 3: Cross multiply
   142,168.86x = 196,191.80 × 78,505.29
4. Step 4: Simplify right side
   142,168.86x = 15,402,093,762.10
5. Step 5: Solve for x
   x = 15,402,093,762.10/142,168.86
6. Step 6: Final answer
   x = 108,336.62