Finding the Fourth Proportional to 2,738.88, 4,108.86 and 890.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,738.88 : 4,108.86 = 890.28 : x
2. Step 2: Convert to fraction form
   2,738.88/4,108.86 = 890.28/x
3. Step 3: Cross multiply
   2,738.88x = 4,108.86 × 890.28
4. Step 4: Simplify right side
   2,738.88x = 3,658,035.88
5. Step 5: Solve for x
   x = 3,658,035.88/2,738.88
6. Step 6: Final answer
   x = 1,335.60