Finding the Fourth Proportional to 2,215.53, 3,323.03 and 1,215.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,215.53 : 3,323.03 = 1,215.18 : x
2. Step 2: Convert to fraction form
   2,215.53/3,323.03 = 1,215.18/x
3. Step 3: Cross multiply
   2,215.53x = 3,323.03 × 1,215.18
4. Step 4: Simplify right side
   2,215.53x = 4,038,073.52
5. Step 5: Solve for x
   x = 4,038,073.52/2,215.53
6. Step 6: Final answer
   x = 1,822.62