Finding the Fourth Proportional to 220,082.72, 303,786.42 and 129,434.72

Step by Step Solution

1. Step 1: Write the proportion equation
   220,082.72 : 303,786.42 = 129,434.72 : x
2. Step 2: Convert to fraction form
   220,082.72/303,786.42 = 129,434.72/x
3. Step 3: Cross multiply
   220,082.72x = 303,786.42 × 129,434.72
4. Step 4: Simplify right side
   220,082.72x = 39,320,510,212.50
5. Step 5: Solve for x
   x = 39,320,510,212.50/220,082.72
6. Step 6: Final answer
   x = 178,662.41