Finding the Fourth Proportional to 2,208.02, 3,312.06 and 908.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,208.02 : 3,312.06 = 908.78 : x
2. Step 2: Convert to fraction form
   2,208.02/3,312.06 = 908.78/x
3. Step 3: Cross multiply
   2,208.02x = 3,312.06 × 908.78
4. Step 4: Simplify right side
   2,208.02x = 3,009,933.89
5. Step 5: Solve for x
   x = 3,009,933.89/2,208.02
6. Step 6: Final answer
   x = 1,363.18