Finding the Fourth Proportional to 1,064.09, 1,468.59 and 644.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,064.09 : 1,468.59 = 644.71 : x
2. Step 2: Convert to fraction form
   1,064.09/1,468.59 = 644.71/x
3. Step 3: Cross multiply
   1,064.09x = 1,468.59 × 644.71
4. Step 4: Simplify right side
   1,064.09x = 946,814.66
5. Step 5: Solve for x
   x = 946,814.66/1,064.09
6. Step 6: Final answer
   x = 889.79