Finding the Fourth Proportional to 2,167.93, 2,991.58 and 1,223.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,167.93 : 2,991.58 = 1,223.96 : x
2. Step 2: Convert to fraction form
   2,167.93/2,991.58 = 1,223.96/x
3. Step 3: Cross multiply
   2,167.93x = 2,991.58 × 1,223.96
4. Step 4: Simplify right side
   2,167.93x = 3,661,556.24
5. Step 5: Solve for x
   x = 3,661,556.24/2,167.93
6. Step 6: Final answer
   x = 1,688.96