Finding the Fourth Proportional to 8,308.91, 12,459.72 and 3,111.14

Step by Step Solution

1. Step 1: Write the proportion equation
   8,308.91 : 12,459.72 = 3,111.14 : x
2. Step 2: Convert to fraction form
   8,308.91/12,459.72 = 3,111.14/x
3. Step 3: Cross multiply
   8,308.91x = 12,459.72 × 3,111.14
4. Step 4: Simplify right side
   8,308.91x = 38,763,964.43
5. Step 5: Solve for x
   x = 38,763,964.43/8,308.91
6. Step 6: Final answer
   x = 4,665.35