Finding the Fourth Proportional to 1,148.52, 1,584.73 and 644.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,148.52 : 1,584.73 = 644.37 : x
2. Step 2: Convert to fraction form
   1,148.52/1,584.73 = 644.37/x
3. Step 3: Cross multiply
   1,148.52x = 1,584.73 × 644.37
4. Step 4: Simplify right side
   1,148.52x = 1,021,152.47
5. Step 5: Solve for x
   x = 1,021,152.47/1,148.52
6. Step 6: Final answer
   x = 889.10