Finding the Fourth Proportional to 13,086.50, 18,058.98 and 7,118.06

Step by Step Solution

1. Step 1: Write the proportion equation
   13,086.50 : 18,058.98 = 7,118.06 : x
2. Step 2: Convert to fraction form
   13,086.50/18,058.98 = 7,118.06/x
3. Step 3: Cross multiply
   13,086.50x = 18,058.98 × 7,118.06
4. Step 4: Simplify right side
   13,086.50x = 128,544,903.18
5. Step 5: Solve for x
   x = 128,544,903.18/13,086.50
6. Step 6: Final answer
   x = 9,822.71