Finding the Fourth Proportional to 12,162.45, 18,234.11 and 5,136.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,162.45 : 18,234.11 = 5,136.72 : x
2. Step 2: Convert to fraction form
   12,162.45/18,234.11 = 5,136.72/x
3. Step 3: Cross multiply
   12,162.45x = 18,234.11 × 5,136.72
4. Step 4: Simplify right side
   12,162.45x = 93,663,461.98
5. Step 5: Solve for x
   x = 93,663,461.98/12,162.45
6. Step 6: Final answer
   x = 7,701.03