Finding the Fourth Proportional to 1,064.18, 1,468.85 and 644.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,064.18 : 1,468.85 = 644.55 : x
2. Step 2: Convert to fraction form
   1,064.18/1,468.85 = 644.55/x
3. Step 3: Cross multiply
   1,064.18x = 1,468.85 × 644.55
4. Step 4: Simplify right side
   1,064.18x = 946,744.04
5. Step 5: Solve for x
   x = 946,744.04/1,064.18
6. Step 6: Final answer
   x = 889.65