Finding the Fourth Proportional to 142,391.53, 196,661.76 and 96,990.78

Step by Step Solution

1. Step 1: Write the proportion equation
   142,391.53 : 196,661.76 = 96,990.78 : x
2. Step 2: Convert to fraction form
   142,391.53/196,661.76 = 96,990.78/x
3. Step 3: Cross multiply
   142,391.53x = 196,661.76 × 96,990.78
4. Step 4: Simplify right side
   142,391.53x = 19,074,377,872.34
5. Step 5: Solve for x
   x = 19,074,377,872.34/142,391.53
6. Step 6: Final answer
   x = 133,957.25