Finding the Fourth Proportional to 2,211.89, 3,315.53 and 824.63

Step by Step Solution

1. Step 1: Write the proportion equation
   2,211.89 : 3,315.53 = 824.63 : x
2. Step 2: Convert to fraction form
   2,211.89/3,315.53 = 824.63/x
3. Step 3: Cross multiply
   2,211.89x = 3,315.53 × 824.63
4. Step 4: Simplify right side
   2,211.89x = 2,734,064.80
5. Step 5: Solve for x
   x = 2,734,064.80/2,211.89
6. Step 6: Final answer
   x = 1,236.07