Finding the Fourth Proportional to 142,091.68, 196,072.68 and 78,425.50

Step by Step Solution

1. Step 1: Write the proportion equation
   142,091.68 : 196,072.68 = 78,425.50 : x
2. Step 2: Convert to fraction form
   142,091.68/196,072.68 = 78,425.50/x
3. Step 3: Cross multiply
   142,091.68x = 196,072.68 × 78,425.50
4. Step 4: Simplify right side
   142,091.68x = 15,377,097,965.34
5. Step 5: Solve for x
   x = 15,377,097,965.34/142,091.68
6. Step 6: Final answer
   x = 108,219.55