Finding the Fourth Proportional to 142,404.24, 196,515 and 78,740.40

Step by Step Solution

1. Step 1: Write the proportion equation
   142,404.24 : 196,515 = 78,740.40 : x
2. Step 2: Convert to fraction form
   142,404.24/196,515 = 78,740.40/x
3. Step 3: Cross multiply
   142,404.24x = 196,515 × 78,740.40
4. Step 4: Simplify right side
   142,404.24x = 15,473,669,706.00
5. Step 5: Solve for x
   x = 15,473,669,706.00/142,404.24
6. Step 6: Final answer
   x = 108,660.18