Finding the Fourth Proportional to 2,215.72, 3,324.84 and 830.02

Step by Step Solution

1. Step 1: Write the proportion equation
   2,215.72 : 3,324.84 = 830.02 : x
2. Step 2: Convert to fraction form
   2,215.72/3,324.84 = 830.02/x
3. Step 3: Cross multiply
   2,215.72x = 3,324.84 × 830.02
4. Step 4: Simplify right side
   2,215.72x = 2,759,683.70
5. Step 5: Solve for x
   x = 2,759,683.70/2,215.72
6. Step 6: Final answer
   x = 1,245.50