Finding the Fourth Proportional to 142,821.32, 197,082.79 and 78,280.25

Step by Step Solution

1. Step 1: Write the proportion equation
   142,821.32 : 197,082.79 = 78,280.25 : x
2. Step 2: Convert to fraction form
   142,821.32/197,082.79 = 78,280.25/x
3. Step 3: Cross multiply
   142,821.32x = 197,082.79 × 78,280.25
4. Step 4: Simplify right side
   142,821.32x = 15,427,688,890.78
5. Step 5: Solve for x
   x = 15,427,688,890.78/142,821.32
6. Step 6: Final answer
   x = 108,020.91