Finding the Fourth Proportional to 1,064.02, 1,468.32 and 644.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,064.02 : 1,468.32 = 644.61 : x
2. Step 2: Convert to fraction form
   1,064.02/1,468.32 = 644.61/x
3. Step 3: Cross multiply
   1,064.02x = 1,468.32 × 644.61
4. Step 4: Simplify right side
   1,064.02x = 946,493.76
5. Step 5: Solve for x
   x = 946,493.76/1,064.02
6. Step 6: Final answer
   x = 889.55