Finding the Fourth Proportional to 142,086.10, 196,064.84 and 78,419.79

Step by Step Solution

1. Step 1: Write the proportion equation
   142,086.10 : 196,064.84 = 78,419.79 : x
2. Step 2: Convert to fraction form
   142,086.10/196,064.84 = 78,419.79/x
3. Step 3: Cross multiply
   142,086.10x = 196,064.84 × 78,419.79
4. Step 4: Simplify right side
   142,086.10x = 15,375,363,285.07
5. Step 5: Solve for x
   x = 15,375,363,285.07/142,086.10
6. Step 6: Final answer
   x = 108,211.60