Finding the Fourth Proportional to 8,111.57, 12,167.09 and 3,430.30

Step by Step Solution

1. Step 1: Write the proportion equation
   8,111.57 : 12,167.09 = 3,430.30 : x
2. Step 2: Convert to fraction form
   8,111.57/12,167.09 = 3,430.30/x
3. Step 3: Cross multiply
   8,111.57x = 12,167.09 × 3,430.30
4. Step 4: Simplify right side
   8,111.57x = 41,736,747.29
5. Step 5: Solve for x
   x = 41,736,747.29/8,111.57
6. Step 6: Final answer
   x = 5,145.34