Finding the Fourth Proportional to 2,208, 3,312.06 and 1,111.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,208 : 3,312.06 = 1,111.76 : x
2. Step 2: Convert to fraction form
   2,208/3,312.06 = 1,111.76/x
3. Step 3: Cross multiply
   2,208x = 3,312.06 × 1,111.76
4. Step 4: Simplify right side
   2,208x = 3,682,215.83
5. Step 5: Solve for x
   x = 3,682,215.83/2,208
6. Step 6: Final answer
   x = 1,667.67