Finding the Fourth Proportional to 1,167.96, 1,611.72 and 644.04

Step by Step Solution

1. Step 1: Write the proportion equation
   1,167.96 : 1,611.72 = 644.04 : x
2. Step 2: Convert to fraction form
   1,167.96/1,611.72 = 644.04/x
3. Step 3: Cross multiply
   1,167.96x = 1,611.72 × 644.04
4. Step 4: Simplify right side
   1,167.96x = 1,038,012.15
5. Step 5: Solve for x
   x = 1,038,012.15/1,167.96
6. Step 6: Final answer
   x = 888.74