Finding the Fourth Proportional to 2,217.59, 3,060.19 and 1,222.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,217.59 : 3,060.19 = 1,222.80 : x
2. Step 2: Convert to fraction form
   2,217.59/3,060.19 = 1,222.80/x
3. Step 3: Cross multiply
   2,217.59x = 3,060.19 × 1,222.80
4. Step 4: Simplify right side
   2,217.59x = 3,742,012.77
5. Step 5: Solve for x
   x = 3,742,012.77/2,217.59
6. Step 6: Final answer
   x = 1,687.43