Finding the Fourth Proportional to 2,672.17, 4,008.28 and 823.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,672.17 : 4,008.28 = 823.30 : x
2. Step 2: Convert to fraction form
   2,672.17/4,008.28 = 823.30/x
3. Step 3: Cross multiply
   2,672.17x = 4,008.28 × 823.30
4. Step 4: Simplify right side
   2,672.17x = 3,300,014.87
5. Step 5: Solve for x
   x = 3,300,014.87/2,672.17
6. Step 6: Final answer
   x = 1,234.96