Finding the Fourth Proportional to 1,168.03, 1,611.89 and 644.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,168.03 : 1,611.89 = 644.06 : x
2. Step 2: Convert to fraction form
   1,168.03/1,611.89 = 644.06/x
3. Step 3: Cross multiply
   1,168.03x = 1,611.89 × 644.06
4. Step 4: Simplify right side
   1,168.03x = 1,038,157.10
5. Step 5: Solve for x
   x = 1,038,157.10/1,168.03
6. Step 6: Final answer
   x = 888.81