Finding the Fourth Proportional to 1,144.98, 1,714.43 and 912.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,144.98 : 1,714.43 = 912.31 : x
2. Step 2: Convert to fraction form
   1,144.98/1,714.43 = 912.31/x
3. Step 3: Cross multiply
   1,144.98x = 1,714.43 × 912.31
4. Step 4: Simplify right side
   1,144.98x = 1,564,082.79
5. Step 5: Solve for x
   x = 1,564,082.79/1,144.98
6. Step 6: Final answer
   x = 1,366.04