Finding the Fourth Proportional to 2,215.42, 3,324.30 and 983.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,215.42 : 3,324.30 = 983.72 : x
2. Step 2: Convert to fraction form
   2,215.42/3,324.30 = 983.72/x
3. Step 3: Cross multiply
   2,215.42x = 3,324.30 × 983.72
4. Step 4: Simplify right side
   2,215.42x = 3,270,160.09
5. Step 5: Solve for x
   x = 3,270,160.09/2,215.42
6. Step 6: Final answer
   x = 1,476.09