Finding the Fourth Proportional to 8,111.19, 12,171.56 and 3,430.89

Step by Step Solution

1. Step 1: Write the proportion equation
   8,111.19 : 12,171.56 = 3,430.89 : x
2. Step 2: Convert to fraction form
   8,111.19/12,171.56 = 3,430.89/x
3. Step 3: Cross multiply
   8,111.19x = 12,171.56 × 3,430.89
4. Step 4: Simplify right side
   8,111.19x = 41,759,283.49
5. Step 5: Solve for x
   x = 41,759,283.49/8,111.19
6. Step 6: Final answer
   x = 5,148.35