Finding the Fourth Proportional to 443,782.46, 665,707.72 and 128,242.10

Step by Step Solution

1. Step 1: Write the proportion equation
   443,782.46 : 665,707.72 = 128,242.10 : x
2. Step 2: Convert to fraction form
   443,782.46/665,707.72 = 128,242.10/x
3. Step 3: Cross multiply
   443,782.46x = 665,707.72 × 128,242.10
4. Step 4: Simplify right side
   443,782.46x = 85,371,755,999.01
5. Step 5: Solve for x
   x = 85,371,755,999.01/443,782.46
6. Step 6: Final answer
   x = 192,372.98