Finding the Fourth Proportional to 1,784.20, 2,674.41 and 688.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,784.20 : 2,674.41 = 688.09 : x
2. Step 2: Convert to fraction form
   1,784.20/2,674.41 = 688.09/x
3. Step 3: Cross multiply
   1,784.20x = 2,674.41 × 688.09
4. Step 4: Simplify right side
   1,784.20x = 1,840,234.78
5. Step 5: Solve for x
   x = 1,840,234.78/1,784.20
6. Step 6: Final answer
   x = 1,031.41