Finding the Fourth Proportional to 8,212.79, 12,315.24 and 5,748.77

Step by Step Solution

1. Step 1: Write the proportion equation
   8,212.79 : 12,315.24 = 5,748.77 : x
2. Step 2: Convert to fraction form
   8,212.79/12,315.24 = 5,748.77/x
3. Step 3: Cross multiply
   8,212.79x = 12,315.24 × 5,748.77
4. Step 4: Simplify right side
   8,212.79x = 70,797,513.04
5. Step 5: Solve for x
   x = 70,797,513.04/8,212.79
6. Step 6: Final answer
   x = 8,620.39