Finding the Fourth Proportional to 142,109.13, 196,110.41 and 78,446.78

Step by Step Solution

1. Step 1: Write the proportion equation
   142,109.13 : 196,110.41 = 78,446.78 : x
2. Step 2: Convert to fraction form
   142,109.13/196,110.41 = 78,446.78/x
3. Step 3: Cross multiply
   142,109.13x = 196,110.41 × 78,446.78
4. Step 4: Simplify right side
   142,109.13x = 15,384,229,894.82
5. Step 5: Solve for x
   x = 15,384,229,894.82/142,109.13
6. Step 6: Final answer
   x = 108,256.45