Finding the Fourth Proportional to 1,064.05, 1,468.41 and 644.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,064.05 : 1,468.41 = 644.48 : x
2. Step 2: Convert to fraction form
   1,064.05/1,468.41 = 644.48/x
3. Step 3: Cross multiply
   1,064.05x = 1,468.41 × 644.48
4. Step 4: Simplify right side
   1,064.05x = 946,355.95
5. Step 5: Solve for x
   x = 946,355.95/1,064.05
6. Step 6: Final answer
   x = 889.39