Finding the Fourth Proportional to 142,012.91, 195,978.48 and 78,350.69

Step by Step Solution

1. Step 1: Write the proportion equation
   142,012.91 : 195,978.48 = 78,350.69 : x
2. Step 2: Convert to fraction form
   142,012.91/195,978.48 = 78,350.69/x
3. Step 3: Cross multiply
   142,012.91x = 195,978.48 × 78,350.69
4. Step 4: Simplify right side
   142,012.91x = 15,355,049,133.15
5. Step 5: Solve for x
   x = 15,355,049,133.15/142,012.91
6. Step 6: Final answer
   x = 108,124.32