Finding the Fourth Proportional to 1,131.09, 1,560.82 and 658.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.09 : 1,560.82 = 658.91 : x
2. Step 2: Convert to fraction form
   1,131.09/1,560.82 = 658.91/x
3. Step 3: Cross multiply
   1,131.09x = 1,560.82 × 658.91
4. Step 4: Simplify right side
   1,131.09x = 1,028,439.01
5. Step 5: Solve for x
   x = 1,028,439.01/1,131.09
6. Step 6: Final answer
   x = 909.25