Finding the Fourth Proportional to 142,013.88, 195,978.02 and 78,354.36

Step by Step Solution

1. Step 1: Write the proportion equation
   142,013.88 : 195,978.02 = 78,354.36 : x
2. Step 2: Convert to fraction form
   142,013.88/195,978.02 = 78,354.36/x
3. Step 3: Cross multiply
   142,013.88x = 195,978.02 × 78,354.36
4. Step 4: Simplify right side
   142,013.88x = 15,355,732,331.17
5. Step 5: Solve for x
   x = 15,355,732,331.17/142,013.88
6. Step 6: Final answer
   x = 108,128.39