Finding the Fourth Proportional to 1,145.25, 1,580.51 and 697.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,145.25 : 1,580.51 = 697.43 : x
2. Step 2: Convert to fraction form
   1,145.25/1,580.51 = 697.43/x
3. Step 3: Cross multiply
   1,145.25x = 1,580.51 × 697.43
4. Step 4: Simplify right side
   1,145.25x = 1,102,300.78
5. Step 5: Solve for x
   x = 1,102,300.78/1,145.25
6. Step 6: Final answer
   x = 962.50