Finding the Fourth Proportional to 2,154.39, 2,973.06 and 1,222.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,154.39 : 2,973.06 = 1,222.89 : x
2. Step 2: Convert to fraction form
   2,154.39/2,973.06 = 1,222.89/x
3. Step 3: Cross multiply
   2,154.39x = 2,973.06 × 1,222.89
4. Step 4: Simplify right side
   2,154.39x = 3,635,732.78
5. Step 5: Solve for x
   x = 3,635,732.78/2,154.39
6. Step 6: Final answer
   x = 1,687.59