Finding the Fourth Proportional to 12,136.05, 18,189.68 and 5,116.05

Step by Step Solution

1. Step 1: Write the proportion equation
   12,136.05 : 18,189.68 = 5,116.05 : x
2. Step 2: Convert to fraction form
   12,136.05/18,189.68 = 5,116.05/x
3. Step 3: Cross multiply
   12,136.05x = 18,189.68 × 5,116.05
4. Step 4: Simplify right side
   12,136.05x = 93,059,286.78
5. Step 5: Solve for x
   x = 93,059,286.78/12,136.05
6. Step 6: Final answer
   x = 7,668.00