Finding the Fourth Proportional to 142,436.72, 196,563.84 and 78,775.76

Step by Step Solution

1. Step 1: Write the proportion equation
   142,436.72 : 196,563.84 = 78,775.76 : x
2. Step 2: Convert to fraction form
   142,436.72/196,563.84 = 78,775.76/x
3. Step 3: Cross multiply
   142,436.72x = 196,563.84 × 78,775.76
4. Step 4: Simplify right side
   142,436.72x = 15,484,465,884.52
5. Step 5: Solve for x
   x = 15,484,465,884.52/142,436.72
6. Step 6: Final answer
   x = 108,711.19