Finding the Fourth Proportional to 2,166.53, 2,989.81 and 1,222.52

Step by Step Solution

1. Step 1: Write the proportion equation
   2,166.53 : 2,989.81 = 1,222.52 : x
2. Step 2: Convert to fraction form
   2,166.53/2,989.81 = 1,222.52/x
3. Step 3: Cross multiply
   2,166.53x = 2,989.81 × 1,222.52
4. Step 4: Simplify right side
   2,166.53x = 3,655,092.35
5. Step 5: Solve for x
   x = 3,655,092.35/2,166.53
6. Step 6: Final answer
   x = 1,687.07