Finding the Fourth Proportional to 13,086.28, 18,058.55 and 7,117.94

Step by Step Solution

1. Step 1: Write the proportion equation
   13,086.28 : 18,058.55 = 7,117.94 : x
2. Step 2: Convert to fraction form
   13,086.28/18,058.55 = 7,117.94/x
3. Step 3: Cross multiply
   13,086.28x = 18,058.55 × 7,117.94
4. Step 4: Simplify right side
   13,086.28x = 128,539,675.39
5. Step 5: Solve for x
   x = 128,539,675.39/13,086.28
6. Step 6: Final answer
   x = 9,822.48