Finding the Fourth Proportional to 13,086.20, 18,058.18 and 7,117.82

Step by Step Solution

1. Step 1: Write the proportion equation
   13,086.20 : 18,058.18 = 7,117.82 : x
2. Step 2: Convert to fraction form
   13,086.20/18,058.18 = 7,117.82/x
3. Step 3: Cross multiply
   13,086.20x = 18,058.18 × 7,117.82
4. Step 4: Simplify right side
   13,086.20x = 128,534,874.77
5. Step 5: Solve for x
   x = 128,534,874.77/13,086.20
6. Step 6: Final answer
   x = 9,822.17