Finding the Fourth Proportional to 2,167.55, 2,991.15 and 1,223.33

Step by Step Solution

1. Step 1: Write the proportion equation
   2,167.55 : 2,991.15 = 1,223.33 : x
2. Step 2: Convert to fraction form
   2,167.55/2,991.15 = 1,223.33/x
3. Step 3: Cross multiply
   2,167.55x = 2,991.15 × 1,223.33
4. Step 4: Simplify right side
   2,167.55x = 3,659,148.57
5. Step 5: Solve for x
   x = 3,659,148.57/2,167.55
6. Step 6: Final answer
   x = 1,688.15