Finding the Fourth Proportional to 1,168.67, 1,612.76 and 644.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,168.67 : 1,612.76 = 644.71 : x
2. Step 2: Convert to fraction form
   1,168.67/1,612.76 = 644.71/x
3. Step 3: Cross multiply
   1,168.67x = 1,612.76 × 644.71
4. Step 4: Simplify right side
   1,168.67x = 1,039,762.50
5. Step 5: Solve for x
   x = 1,039,762.50/1,168.67
6. Step 6: Final answer
   x = 889.70