Finding the Fourth Proportional to 2,798.10, 3,858.80 and 2,238.59

Step by Step Solution

1. Step 1: Write the proportion equation
   2,798.10 : 3,858.80 = 2,238.59 : x
2. Step 2: Convert to fraction form
   2,798.10/3,858.80 = 2,238.59/x
3. Step 3: Cross multiply
   2,798.10x = 3,858.80 × 2,238.59
4. Step 4: Simplify right side
   2,798.10x = 8,638,240.61
5. Step 5: Solve for x
   x = 8,638,240.61/2,798.10
6. Step 6: Final answer
   x = 3,087.18