Finding the Fourth Proportional to 2,238.60, 3,084.48 and 1,648.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,238.60 : 3,084.48 = 1,648.20 : x
2. Step 2: Convert to fraction form
   2,238.60/3,084.48 = 1,648.20/x
3. Step 3: Cross multiply
   2,238.60x = 3,084.48 × 1,648.20
4. Step 4: Simplify right side
   2,238.60x = 5,083,839.94
5. Step 5: Solve for x
   x = 5,083,839.94/2,238.60
6. Step 6: Final answer
   x = 2,270.99