Finding the Fourth Proportional to 142,013.40, 195,978.24 and 78,351

Step by Step Solution

1. Step 1: Write the proportion equation
   142,013.40 : 195,978.24 = 78,351 : x
2. Step 2: Convert to fraction form
   142,013.40/195,978.24 = 78,351/x
3. Step 3: Cross multiply
   142,013.40x = 195,978.24 × 78,351
4. Step 4: Simplify right side
   142,013.40x = 15,355,091,082.24
5. Step 5: Solve for x
   x = 15,355,091,082.24/142,013.40
6. Step 6: Final answer
   x = 108,124.24