Finding the Fourth Proportional to 1,728.53, 2,591.74 and 688.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,728.53 : 2,591.74 = 688.69 : x
2. Step 2: Convert to fraction form
   1,728.53/2,591.74 = 688.69/x
3. Step 3: Cross multiply
   1,728.53x = 2,591.74 × 688.69
4. Step 4: Simplify right side
   1,728.53x = 1,784,892.46
5. Step 5: Solve for x
   x = 1,784,892.46/1,728.53
6. Step 6: Final answer
   x = 1,032.61