Finding the Fourth Proportional to 142,353.72, 196,433.10 and 78,681.24

Step by Step Solution

1. Step 1: Write the proportion equation
   142,353.72 : 196,433.10 = 78,681.24 : x
2. Step 2: Convert to fraction form
   142,353.72/196,433.10 = 78,681.24/x
3. Step 3: Cross multiply
   142,353.72x = 196,433.10 × 78,681.24
4. Step 4: Simplify right side
   142,353.72x = 15,455,599,885.04
5. Step 5: Solve for x
   x = 15,455,599,885.04/142,353.72
6. Step 6: Final answer
   x = 108,571.80