Finding the Fourth Proportional to 1,167.98, 1,611.81 and 644.00

Step by Step Solution

1. Step 1: Write the proportion equation
   1,167.98 : 1,611.81 = 644.00 : x
2. Step 2: Convert to fraction form
   1,167.98/1,611.81 = 644.00/x
3. Step 3: Cross multiply
   1,167.98x = 1,611.81 × 644.00
4. Step 4: Simplify right side
   1,167.98x = 1,038,009.67
5. Step 5: Solve for x
   x = 1,038,009.67/1,167.98
6. Step 6: Final answer
   x = 888.73