Finding the Fourth Proportional to 13,107.89, 18,090.34 and 8,071.11

Step by Step Solution

1. Step 1: Write the proportion equation
   13,107.89 : 18,090.34 = 8,071.11 : x
2. Step 2: Convert to fraction form
   13,107.89/18,090.34 = 8,071.11/x
3. Step 3: Cross multiply
   13,107.89x = 18,090.34 × 8,071.11
4. Step 4: Simplify right side
   13,107.89x = 146,009,103.90
5. Step 5: Solve for x
   x = 146,009,103.90/13,107.89
6. Step 6: Final answer
   x = 11,139.02