Finding the Fourth Proportional to 13,665.16, 18,855.54 and 8,074.12

Step by Step Solution

1. Step 1: Write the proportion equation
   13,665.16 : 18,855.54 = 8,074.12 : x
2. Step 2: Convert to fraction form
   13,665.16/18,855.54 = 8,074.12/x
3. Step 3: Cross multiply
   13,665.16x = 18,855.54 × 8,074.12
4. Step 4: Simplify right side
   13,665.16x = 152,241,892.62
5. Step 5: Solve for x
   x = 152,241,892.62/13,665.16
6. Step 6: Final answer
   x = 11,140.88