Finding the Fourth Proportional to 1,522.16, 2,281.60 and 644.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,522.16 : 2,281.60 = 644.46 : x
2. Step 2: Convert to fraction form
   1,522.16/2,281.60 = 644.46/x
3. Step 3: Cross multiply
   1,522.16x = 2,281.60 × 644.46
4. Step 4: Simplify right side
   1,522.16x = 1,470,385.31
5. Step 5: Solve for x
   x = 1,470,385.31/1,522.16
6. Step 6: Final answer
   x = 965.99