Finding the Fourth Proportional to 3,899.98, 5,380.10 and 2,836.10

Step by Step Solution

1. Step 1: Write the proportion equation
   3,899.98 : 5,380.10 = 2,836.10 : x
2. Step 2: Convert to fraction form
   3,899.98/5,380.10 = 2,836.10/x
3. Step 3: Cross multiply
   3,899.98x = 5,380.10 × 2,836.10
4. Step 4: Simplify right side
   3,899.98x = 15,258,501.61
5. Step 5: Solve for x
   x = 15,258,501.61/3,899.98
6. Step 6: Final answer
   x = 3,912.46