Finding the Fourth Proportional to 1,168.35, 1,612.29 and 644.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,168.35 : 1,612.29 = 644.37 : x
2. Step 2: Convert to fraction form
   1,168.35/1,612.29 = 644.37/x
3. Step 3: Cross multiply
   1,168.35x = 1,612.29 × 644.37
4. Step 4: Simplify right side
   1,168.35x = 1,038,911.31
5. Step 5: Solve for x
   x = 1,038,911.31/1,168.35
6. Step 6: Final answer
   x = 889.21