Finding the Fourth Proportional to 1,641.72, 2,264.61 and 1,143.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,641.72 : 2,264.61 = 1,143.48 : x
2. Step 2: Convert to fraction form
   1,641.72/2,264.61 = 1,143.48/x
3. Step 3: Cross multiply
   1,641.72x = 2,264.61 × 1,143.48
4. Step 4: Simplify right side
   1,641.72x = 2,589,536.24
5. Step 5: Solve for x
   x = 2,589,536.24/1,641.72
6. Step 6: Final answer
   x = 1,577.33