Finding the Fourth Proportional to 1,017.98, 1,528.22 and 671.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,017.98 : 1,528.22 = 671.61 : x
2. Step 2: Convert to fraction form
   1,017.98/1,528.22 = 671.61/x
3. Step 3: Cross multiply
   1,017.98x = 1,528.22 × 671.61
4. Step 4: Simplify right side
   1,017.98x = 1,026,361.26
5. Step 5: Solve for x
   x = 1,026,361.26/1,017.98
6. Step 6: Final answer
   x = 1,008.23