Finding the Fourth Proportional to 13,086.10, 18,058.42 and 7,421.36

Step by Step Solution

1. Step 1: Write the proportion equation
   13,086.10 : 18,058.42 = 7,421.36 : x
2. Step 2: Convert to fraction form
   13,086.10/18,058.42 = 7,421.36/x
3. Step 3: Cross multiply
   13,086.10x = 18,058.42 × 7,421.36
4. Step 4: Simplify right side
   13,086.10x = 134,018,035.85
5. Step 5: Solve for x
   x = 134,018,035.85/13,086.10
6. Step 6: Final answer
   x = 10,241.25