Finding the Fourth Proportional to 1,168.30, 1,612.34 and 644.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,168.30 : 1,612.34 = 644.43 : x
2. Step 2: Convert to fraction form
   1,168.30/1,612.34 = 644.43/x
3. Step 3: Cross multiply
   1,168.30x = 1,612.34 × 644.43
4. Step 4: Simplify right side
   1,168.30x = 1,039,040.27
5. Step 5: Solve for x
   x = 1,039,040.27/1,168.30
6. Step 6: Final answer
   x = 889.36