Finding the Fourth Proportional to 12,136.30, 18,190.05 and 5,116.30

Step by Step Solution

1. Step 1: Write the proportion equation
   12,136.30 : 18,190.05 = 5,116.30 : x
2. Step 2: Convert to fraction form
   12,136.30/18,190.05 = 5,116.30/x
3. Step 3: Cross multiply
   12,136.30x = 18,190.05 × 5,116.30
4. Step 4: Simplify right side
   12,136.30x = 93,065,752.82
5. Step 5: Solve for x
   x = 93,065,752.82/12,136.30
6. Step 6: Final answer
   x = 7,668.38