Finding the Fourth Proportional to 1,141.83, 1,575.79 and 644.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,141.83 : 1,575.79 = 644.49 : x
2. Step 2: Convert to fraction form
   1,141.83/1,575.79 = 644.49/x
3. Step 3: Cross multiply
   1,141.83x = 1,575.79 × 644.49
4. Step 4: Simplify right side
   1,141.83x = 1,015,579.29
5. Step 5: Solve for x
   x = 1,015,579.29/1,141.83
6. Step 6: Final answer
   x = 889.43