Finding the Fourth Proportional to 1,064.07, 1,468.49 and 644.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,064.07 : 1,468.49 = 644.31 : x
2. Step 2: Convert to fraction form
   1,064.07/1,468.49 = 644.31/x
3. Step 3: Cross multiply
   1,064.07x = 1,468.49 × 644.31
4. Step 4: Simplify right side
   1,064.07x = 946,159.57
5. Step 5: Solve for x
   x = 946,159.57/1,064.07
6. Step 6: Final answer
   x = 889.19