Finding the Fourth Proportional to 11,690.16, 16,146.12 and 9,308.10

Step by Step Solution

1. Step 1: Write the proportion equation
   11,690.16 : 16,146.12 = 9,308.10 : x
2. Step 2: Convert to fraction form
   11,690.16/16,146.12 = 9,308.10/x
3. Step 3: Cross multiply
   11,690.16x = 16,146.12 × 9,308.10
4. Step 4: Simplify right side
   11,690.16x = 150,289,699.57
5. Step 5: Solve for x
   x = 150,289,699.57/11,690.16
6. Step 6: Final answer
   x = 12,856.09