Finding the Fourth Proportional to 1,168.52, 1,612.52 and 644.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,168.52 : 1,612.52 = 644.54 : x
2. Step 2: Convert to fraction form
   1,168.52/1,612.52 = 644.54/x
3. Step 3: Cross multiply
   1,168.52x = 1,612.52 × 644.54
4. Step 4: Simplify right side
   1,168.52x = 1,039,333.64
5. Step 5: Solve for x
   x = 1,039,333.64/1,168.52
6. Step 6: Final answer
   x = 889.44