Finding the Fourth Proportional to 1,809.72, 2,708.53 and 1,215.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,809.72 : 2,708.53 = 1,215.96 : x
2. Step 2: Convert to fraction form
   1,809.72/2,708.53 = 1,215.96/x
3. Step 3: Cross multiply
   1,809.72x = 2,708.53 × 1,215.96
4. Step 4: Simplify right side
   1,809.72x = 3,293,469.71
5. Step 5: Solve for x
   x = 3,293,469.71/1,809.72
6. Step 6: Final answer
   x = 1,819.88