Finding the Fourth Proportional to 142,109.26, 196,110.59 and 78,446.90

Step by Step Solution

1. Step 1: Write the proportion equation
   142,109.26 : 196,110.59 = 78,446.90 : x
2. Step 2: Convert to fraction form
   142,109.26/196,110.59 = 78,446.90/x
3. Step 3: Cross multiply
   142,109.26x = 196,110.59 × 78,446.90
4. Step 4: Simplify right side
   142,109.26x = 15,384,267,940.71
5. Step 5: Solve for x
   x = 15,384,267,940.71/142,109.26
6. Step 6: Final answer
   x = 108,256.62