Finding the Fourth Proportional to 2,671.72, 3,687.20 and 1,553.02

Step by Step Solution

1. Step 1: Write the proportion equation
   2,671.72 : 3,687.20 = 1,553.02 : x
2. Step 2: Convert to fraction form
   2,671.72/3,687.20 = 1,553.02/x
3. Step 3: Cross multiply
   2,671.72x = 3,687.20 × 1,553.02
4. Step 4: Simplify right side
   2,671.72x = 5,726,295.34
5. Step 5: Solve for x
   x = 5,726,295.34/2,671.72
6. Step 6: Final answer
   x = 2,143.30