Finding the Fourth Proportional to 1,141.38, 1,575.25 and 644.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,141.38 : 1,575.25 = 644.12 : x
2. Step 2: Convert to fraction form
   1,141.38/1,575.25 = 644.12/x
3. Step 3: Cross multiply
   1,141.38x = 1,575.25 × 644.12
4. Step 4: Simplify right side
   1,141.38x = 1,014,650.03
5. Step 5: Solve for x
   x = 1,014,650.03/1,141.38
6. Step 6: Final answer
   x = 888.97