Finding the Fourth Proportional to 1,168.32, 1,612.24 and 644.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,168.32 : 1,612.24 = 644.35 : x
2. Step 2: Convert to fraction form
   1,168.32/1,612.24 = 644.35/x
3. Step 3: Cross multiply
   1,168.32x = 1,612.24 × 644.35
4. Step 4: Simplify right side
   1,168.32x = 1,038,835.56
5. Step 5: Solve for x
   x = 1,038,835.56/1,168.32
6. Step 6: Final answer
   x = 889.17