Finding the Fourth Proportional to 1,141.93, 1,575.82 and 644.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,141.93 : 1,575.82 = 644.61 : x
2. Step 2: Convert to fraction form
   1,141.93/1,575.82 = 644.61/x
3. Step 3: Cross multiply
   1,141.93x = 1,575.82 × 644.61
4. Step 4: Simplify right side
   1,141.93x = 1,015,793.43
5. Step 5: Solve for x
   x = 1,015,793.43/1,141.93
6. Step 6: Final answer
   x = 889.54