Finding the Fourth Proportional to 1,141.59, 1,575.39 and 644.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,141.59 : 1,575.39 = 644.39 : x
2. Step 2: Convert to fraction form
   1,141.59/1,575.39 = 644.39/x
3. Step 3: Cross multiply
   1,141.59x = 1,575.39 × 644.39
4. Step 4: Simplify right side
   1,141.59x = 1,015,169.50
5. Step 5: Solve for x
   x = 1,015,169.50/1,141.59
6. Step 6: Final answer
   x = 889.26