Finding the Fourth Proportional to 2,667.31, 3,998.20 and 1,108.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,667.31 : 3,998.20 = 1,108.16 : x
2. Step 2: Convert to fraction form
   2,667.31/3,998.20 = 1,108.16/x
3. Step 3: Cross multiply
   2,667.31x = 3,998.20 × 1,108.16
4. Step 4: Simplify right side
   2,667.31x = 4,430,662.11
5. Step 5: Solve for x
   x = 4,430,662.11/2,667.31
6. Step 6: Final answer
   x = 1,661.10