Finding the Fourth Proportional to 142,353.75, 196,431.15 and 78,682.89

Step by Step Solution

1. Step 1: Write the proportion equation
   142,353.75 : 196,431.15 = 78,682.89 : x
2. Step 2: Convert to fraction form
   142,353.75/196,431.15 = 78,682.89/x
3. Step 3: Cross multiply
   142,353.75x = 196,431.15 × 78,682.89
4. Step 4: Simplify right side
   142,353.75x = 15,455,770,568.02
5. Step 5: Solve for x
   x = 15,455,770,568.02/142,353.75
6. Step 6: Final answer
   x = 108,572.98