Finding the Fourth Proportional to 1,167.98, 1,611.83 and 644.01

Step by Step Solution

1. Step 1: Write the proportion equation
   1,167.98 : 1,611.83 = 644.01 : x
2. Step 2: Convert to fraction form
   1,167.98/1,611.83 = 644.01/x
3. Step 3: Cross multiply
   1,167.98x = 1,611.83 × 644.01
4. Step 4: Simplify right side
   1,167.98x = 1,038,034.64
5. Step 5: Solve for x
   x = 1,038,034.64/1,167.98
6. Step 6: Final answer
   x = 888.74