Finding the Fourth Proportional to 1,175.56, 1,622.24 and 644.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,175.56 : 1,622.24 = 644.42 : x
2. Step 2: Convert to fraction form
   1,175.56/1,622.24 = 644.42/x
3. Step 3: Cross multiply
   1,175.56x = 1,622.24 × 644.42
4. Step 4: Simplify right side
   1,175.56x = 1,045,403.90
5. Step 5: Solve for x
   x = 1,045,403.90/1,175.56
6. Step 6: Final answer
   x = 889.28