Finding the Fourth Proportional to 1,131.84, 1,697.22 and 644.04

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.84 : 1,697.22 = 644.04 : x
2. Step 2: Convert to fraction form
   1,131.84/1,697.22 = 644.04/x
3. Step 3: Cross multiply
   1,131.84x = 1,697.22 × 644.04
4. Step 4: Simplify right side
   1,131.84x = 1,093,077.57
5. Step 5: Solve for x
   x = 1,093,077.57/1,131.84
6. Step 6: Final answer
   x = 965.75