Finding the Fourth Proportional to 1,082.43, 1,623.30 and 691.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,082.43 : 1,623.30 = 691.89 : x
2. Step 2: Convert to fraction form
   1,082.43/1,623.30 = 691.89/x
3. Step 3: Cross multiply
   1,082.43x = 1,623.30 × 691.89
4. Step 4: Simplify right side
   1,082.43x = 1,123,145.04
5. Step 5: Solve for x
   x = 1,123,145.04/1,082.43
6. Step 6: Final answer
   x = 1,037.61