Finding the Fourth Proportional to 1,168.56, 1,612.59 and 644.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,168.56 : 1,612.59 = 644.58 : x
2. Step 2: Convert to fraction form
   1,168.56/1,612.59 = 644.58/x
3. Step 3: Cross multiply
   1,168.56x = 1,612.59 × 644.58
4. Step 4: Simplify right side
   1,168.56x = 1,039,443.26
5. Step 5: Solve for x
   x = 1,039,443.26/1,168.56
6. Step 6: Final answer
   x = 889.51