Finding the Fourth Proportional to 1,127.79, 1,691.72 and 818.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,127.79 : 1,691.72 = 818.17 : x
2. Step 2: Convert to fraction form
   1,127.79/1,691.72 = 818.17/x
3. Step 3: Cross multiply
   1,127.79x = 1,691.72 × 818.17
4. Step 4: Simplify right side
   1,127.79x = 1,384,114.55
5. Step 5: Solve for x
   x = 1,384,114.55/1,127.79
6. Step 6: Final answer
   x = 1,227.28