Finding the Fourth Proportional to 1,744.64, 2,615.69 and 819.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,744.64 : 2,615.69 = 819.72 : x
2. Step 2: Convert to fraction form
   1,744.64/2,615.69 = 819.72/x
3. Step 3: Cross multiply
   1,744.64x = 2,615.69 × 819.72
4. Step 4: Simplify right side
   1,744.64x = 2,144,129.31
5. Step 5: Solve for x
   x = 2,144,129.31/1,744.64
6. Step 6: Final answer
   x = 1,228.98