Finding the Fourth Proportional to 2,790.40, 3,850.79 and 1,531.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,790.40 : 3,850.79 = 1,531.57 : x
2. Step 2: Convert to fraction form
   2,790.40/3,850.79 = 1,531.57/x
3. Step 3: Cross multiply
   2,790.40x = 3,850.79 × 1,531.57
4. Step 4: Simplify right side
   2,790.40x = 5,897,754.44
5. Step 5: Solve for x
   x = 5,897,754.44/2,790.40
6. Step 6: Final answer
   x = 2,113.59