Finding the Fourth Proportional to 9,408.63, 12,984.05 and 5,160.08

Step by Step Solution

1. Step 1: Write the proportion equation
   9,408.63 : 12,984.05 = 5,160.08 : x
2. Step 2: Convert to fraction form
   9,408.63/12,984.05 = 5,160.08/x
3. Step 3: Cross multiply
   9,408.63x = 12,984.05 × 5,160.08
4. Step 4: Simplify right side
   9,408.63x = 66,998,736.72
5. Step 5: Solve for x
   x = 66,998,736.72/9,408.63
6. Step 6: Final answer
   x = 7,120.99