Finding the Fourth Proportional to 1,225.55, 1,691.27 and 728.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,225.55 : 1,691.27 = 728.18 : x
2. Step 2: Convert to fraction form
   1,225.55/1,691.27 = 728.18/x
3. Step 3: Cross multiply
   1,225.55x = 1,691.27 × 728.18
4. Step 4: Simplify right side
   1,225.55x = 1,231,536.89
5. Step 5: Solve for x
   x = 1,231,536.89/1,225.55
6. Step 6: Final answer
   x = 1,004.89