Finding the Fourth Proportional to 2,790.72, 3,851.15 and 1,531.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,790.72 : 3,851.15 = 1,531.80 : x
2. Step 2: Convert to fraction form
   2,790.72/3,851.15 = 1,531.80/x
3. Step 3: Cross multiply
   2,790.72x = 3,851.15 × 1,531.80
4. Step 4: Simplify right side
   2,790.72x = 5,899,183.91
5. Step 5: Solve for x
   x = 5,899,183.91/2,790.72
6. Step 6: Final answer
   x = 2,113.86