Finding the Fourth Proportional to 1,131.59, 1,695.26 and 644.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.59 : 1,695.26 = 644.99 : x
2. Step 2: Convert to fraction form
   1,131.59/1,695.26 = 644.99/x
3. Step 3: Cross multiply
   1,131.59x = 1,695.26 × 644.99
4. Step 4: Simplify right side
   1,131.59x = 1,093,414.05
5. Step 5: Solve for x
   x = 1,093,414.05/1,131.59
6. Step 6: Final answer
   x = 966.27