Finding the Fourth Proportional to 2,667.20, 3,996.60 and 2,117.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,667.20 : 3,996.60 = 2,117.96 : x
2. Step 2: Convert to fraction form
   2,667.20/3,996.60 = 2,117.96/x
3. Step 3: Cross multiply
   2,667.20x = 3,996.60 × 2,117.96
4. Step 4: Simplify right side
   2,667.20x = 8,464,638.94
5. Step 5: Solve for x
   x = 8,464,638.94/2,667.20
6. Step 6: Final answer
   x = 3,173.60