Finding the Fourth Proportional to 2,798.72, 3,862.17 and 1,539.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,798.72 : 3,862.17 = 1,539.80 : x
2. Step 2: Convert to fraction form
   2,798.72/3,862.17 = 1,539.80/x
3. Step 3: Cross multiply
   2,798.72x = 3,862.17 × 1,539.80
4. Step 4: Simplify right side
   2,798.72x = 5,946,969.37
5. Step 5: Solve for x
   x = 5,946,969.37/2,798.72
6. Step 6: Final answer
   x = 2,124.89