Finding the Fourth Proportional to 2,154, 2,972.55 and 1,222.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,154 : 2,972.55 = 1,222.50 : x
2. Step 2: Convert to fraction form
   2,154/2,972.55 = 1,222.50/x
3. Step 3: Cross multiply
   2,154x = 2,972.55 × 1,222.50
4. Step 4: Simplify right side
   2,154x = 3,633,942.38
5. Step 5: Solve for x
   x = 3,633,942.38/2,154
6. Step 6: Final answer
   x = 1,687.07