Finding the Fourth Proportional to 2,167.19, 2,990.72 and 1,222.98

Step by Step Solution

1. Step 1: Write the proportion equation
   2,167.19 : 2,990.72 = 1,222.98 : x
2. Step 2: Convert to fraction form
   2,167.19/2,990.72 = 1,222.98/x
3. Step 3: Cross multiply
   2,167.19x = 2,990.72 × 1,222.98
4. Step 4: Simplify right side
   2,167.19x = 3,657,584.63
5. Step 5: Solve for x
   x = 3,657,584.63/2,167.19
6. Step 6: Final answer
   x = 1,687.71