Finding the Fourth Proportional to 1,145.31, 1,580.90 and 697.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,145.31 : 1,580.90 = 697.43 : x
2. Step 2: Convert to fraction form
   1,145.31/1,580.90 = 697.43/x
3. Step 3: Cross multiply
   1,145.31x = 1,580.90 × 697.43
4. Step 4: Simplify right side
   1,145.31x = 1,102,555.70
5. Step 5: Solve for x
   x = 1,102,555.70/1,145.31
6. Step 6: Final answer
   x = 962.67