Finding the Fourth Proportional to 1,143.16, 1,577.61 and 671.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,143.16 : 1,577.61 = 671.10 : x
2. Step 2: Convert to fraction form
   1,143.16/1,577.61 = 671.10/x
3. Step 3: Cross multiply
   1,143.16x = 1,577.61 × 671.10
4. Step 4: Simplify right side
   1,143.16x = 1,058,737.03
5. Step 5: Solve for x
   x = 1,058,737.03/1,143.16
6. Step 6: Final answer
   x = 926.15