Finding the Fourth Proportional to 1,672.28, 2,308.82 and 1,229.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,672.28 : 2,308.82 = 1,229.42 : x
2. Step 2: Convert to fraction form
   1,672.28/2,308.82 = 1,229.42/x
3. Step 3: Cross multiply
   1,672.28x = 2,308.82 × 1,229.42
4. Step 4: Simplify right side
   1,672.28x = 2,838,509.48
5. Step 5: Solve for x
   x = 2,838,509.48/1,672.28
6. Step 6: Final answer
   x = 1,697.39