Finding the Fourth Proportional to 1,008.89, 1,391.99 and 610.23

Step by Step Solution

1. Step 1: Write the proportion equation
   1,008.89 : 1,391.99 = 610.23 : x
2. Step 2: Convert to fraction form
   1,008.89/1,391.99 = 610.23/x
3. Step 3: Cross multiply
   1,008.89x = 1,391.99 × 610.23
4. Step 4: Simplify right side
   1,008.89x = 849,436.23
5. Step 5: Solve for x
   x = 849,436.23/1,008.89
6. Step 6: Final answer
   x = 841.95