Finding the Fourth Proportional to 1,089.31, 1,502.50 and 696.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,089.31 : 1,502.50 = 696.15 : x
2. Step 2: Convert to fraction form
   1,089.31/1,502.50 = 696.15/x
3. Step 3: Cross multiply
   1,089.31x = 1,502.50 × 696.15
4. Step 4: Simplify right side
   1,089.31x = 1,045,965.38
5. Step 5: Solve for x
   x = 1,045,965.38/1,089.31
6. Step 6: Final answer
   x = 960.21