Finding the Fourth Proportional to 8,308.88, 12,438.36 and 5,388.56

Step by Step Solution

1. Step 1: Write the proportion equation
   8,308.88 : 12,438.36 = 5,388.56 : x
2. Step 2: Convert to fraction form
   8,308.88/12,438.36 = 5,388.56/x
3. Step 3: Cross multiply
   8,308.88x = 12,438.36 × 5,388.56
4. Step 4: Simplify right side
   8,308.88x = 67,024,849.16
5. Step 5: Solve for x
   x = 67,024,849.16/8,308.88
6. Step 6: Final answer
   x = 8,066.65