Finding the Fourth Proportional to 2,217.72, 3,059.08 and 1,321.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,217.72 : 3,059.08 = 1,321.12 : x
2. Step 2: Convert to fraction form
   2,217.72/3,059.08 = 1,321.12/x
3. Step 3: Cross multiply
   2,217.72x = 3,059.08 × 1,321.12
4. Step 4: Simplify right side
   2,217.72x = 4,041,411.77
5. Step 5: Solve for x
   x = 4,041,411.77/2,217.72
6. Step 6: Final answer
   x = 1,822.33