Finding the Fourth Proportional to 2,215.76, 3,320.49 and 1,229.00

Step by Step Solution

1. Step 1: Write the proportion equation
   2,215.76 : 3,320.49 = 1,229.00 : x
2. Step 2: Convert to fraction form
   2,215.76/3,320.49 = 1,229.00/x
3. Step 3: Cross multiply
   2,215.76x = 3,320.49 × 1,229.00
4. Step 4: Simplify right side
   2,215.76x = 4,080,888.89
5. Step 5: Solve for x
   x = 4,080,888.89/2,215.76
6. Step 6: Final answer
   x = 1,841.76