Finding the Fourth Proportional to 13,086.73, 18,059.98 and 7,118.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,086.73 : 18,059.98 = 7,118.72 : x
2. Step 2: Convert to fraction form
   13,086.73/18,059.98 = 7,118.72/x
3. Step 3: Cross multiply
   13,086.73x = 18,059.98 × 7,118.72
4. Step 4: Simplify right side
   13,086.73x = 128,563,850.53
5. Step 5: Solve for x
   x = 128,563,850.53/13,086.73
6. Step 6: Final answer
   x = 9,823.99