Finding the Fourth Proportional to 8,309.91, 12,461.22 and 3,112.14

Step by Step Solution

1. Step 1: Write the proportion equation
   8,309.91 : 12,461.22 = 3,112.14 : x
2. Step 2: Convert to fraction form
   8,309.91/12,461.22 = 3,112.14/x
3. Step 3: Cross multiply
   8,309.91x = 12,461.22 × 3,112.14
4. Step 4: Simplify right side
   8,309.91x = 38,781,061.21
5. Step 5: Solve for x
   x = 38,781,061.21/8,309.91
6. Step 6: Final answer
   x = 4,666.84