Finding the Fourth Proportional to 1,168.22, 1,612.06 and 644.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,168.22 : 1,612.06 = 644.18 : x
2. Step 2: Convert to fraction form
   1,168.22/1,612.06 = 644.18/x
3. Step 3: Cross multiply
   1,168.22x = 1,612.06 × 644.18
4. Step 4: Simplify right side
   1,168.22x = 1,038,447.14
5. Step 5: Solve for x
   x = 1,038,447.14/1,168.22
6. Step 6: Final answer
   x = 888.92