Finding the Fourth Proportional to 1,141.57, 1,575.25 and 644.13

Step by Step Solution

1. Step 1: Write the proportion equation
   1,141.57 : 1,575.25 = 644.13 : x
2. Step 2: Convert to fraction form
   1,141.57/1,575.25 = 644.13/x
3. Step 3: Cross multiply
   1,141.57x = 1,575.25 × 644.13
4. Step 4: Simplify right side
   1,141.57x = 1,014,665.78
5. Step 5: Solve for x
   x = 1,014,665.78/1,141.57
6. Step 6: Final answer
   x = 888.83