Finding the Fourth Proportional to 1,168.63, 1,612.72 and 644.67

Step by Step Solution

1. Step 1: Write the proportion equation
   1,168.63 : 1,612.72 = 644.67 : x
2. Step 2: Convert to fraction form
   1,168.63/1,612.72 = 644.67/x
3. Step 3: Cross multiply
   1,168.63x = 1,612.72 × 644.67
4. Step 4: Simplify right side
   1,168.63x = 1,039,672.20
5. Step 5: Solve for x
   x = 1,039,672.20/1,168.63
6. Step 6: Final answer
   x = 889.65