Finding the Fourth Proportional to 12,136.86, 18,212.58 and 5,116.43

Step by Step Solution

1. Step 1: Write the proportion equation
   12,136.86 : 18,212.58 = 5,116.43 : x
2. Step 2: Convert to fraction form
   12,136.86/18,212.58 = 5,116.43/x
3. Step 3: Cross multiply
   12,136.86x = 18,212.58 × 5,116.43
4. Step 4: Simplify right side
   12,136.86x = 93,183,436.22
5. Step 5: Solve for x
   x = 93,183,436.22/12,136.86
6. Step 6: Final answer
   x = 7,677.72