Finding the Fourth Proportional to 9,408.72, 12,984.12 and 5,216.88

Step by Step Solution

1. Step 1: Write the proportion equation
   9,408.72 : 12,984.12 = 5,216.88 : x
2. Step 2: Convert to fraction form
   9,408.72/12,984.12 = 5,216.88/x
3. Step 3: Cross multiply
   9,408.72x = 12,984.12 × 5,216.88
4. Step 4: Simplify right side
   9,408.72x = 67,736,595.95
5. Step 5: Solve for x
   x = 67,736,595.95/9,408.72
6. Step 6: Final answer
   x = 7,199.34