Finding the Fourth Proportional to 2,167.16, 2,990.48 and 1,222.92

Step by Step Solution

1. Step 1: Write the proportion equation
   2,167.16 : 2,990.48 = 1,222.92 : x
2. Step 2: Convert to fraction form
   2,167.16/2,990.48 = 1,222.92/x
3. Step 3: Cross multiply
   2,167.16x = 2,990.48 × 1,222.92
4. Step 4: Simplify right side
   2,167.16x = 3,657,111.69
5. Step 5: Solve for x
   x = 3,657,111.69/2,167.16
6. Step 6: Final answer
   x = 1,687.52