Finding the Fourth Proportional to 142,334.28, 196,431.50 and 78,670.72

Step by Step Solution

1. Step 1: Write the proportion equation
   142,334.28 : 196,431.50 = 78,670.72 : x
2. Step 2: Convert to fraction form
   142,334.28/196,431.50 = 78,670.72/x
3. Step 3: Cross multiply
   142,334.28x = 196,431.50 × 78,670.72
4. Step 4: Simplify right side
   142,334.28x = 15,453,407,535.68
5. Step 5: Solve for x
   x = 15,453,407,535.68/142,334.28
6. Step 6: Final answer
   x = 108,571.23