Finding the Fourth Proportional to 2,790.78, 3,851.32 and 1,531.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,790.78 : 3,851.32 = 1,531.80 : x
2. Step 2: Convert to fraction form
   2,790.78/3,851.32 = 1,531.80/x
3. Step 3: Cross multiply
   2,790.78x = 3,851.32 × 1,531.80
4. Step 4: Simplify right side
   2,790.78x = 5,899,451.98
5. Step 5: Solve for x
   x = 5,899,451.98/2,790.78
6. Step 6: Final answer
   x = 2,113.91