Finding the Fourth Proportional to 9,383.87, 12,922.17 and 8,388.78

Step by Step Solution

1. Step 1: Write the proportion equation
   9,383.87 : 12,922.17 = 8,388.78 : x
2. Step 2: Convert to fraction form
   9,383.87/12,922.17 = 8,388.78/x
3. Step 3: Cross multiply
   9,383.87x = 12,922.17 × 8,388.78
4. Step 4: Simplify right side
   9,383.87x = 108,401,241.25
5. Step 5: Solve for x
   x = 108,401,241.25/9,383.87
6. Step 6: Final answer
   x = 11,551.88