Finding the Third Proportional to 8,136 and 12,154.50

Step by Step Solution

1. Step 1: Write the proportion equation
   8,136 : 12,154.50 = 12,154.50 : x
2. Step 2: Convert to fraction form
   8,136/12,154.50 = 12,154.50/x
3. Step 3: Cross multiply
   8,136x = 12,154.50 × 12,154.50
4. Step 4: Simplify right side
   8,136x = 147,731,870.25
5. Step 5: Solve for x
   x = 147,731,870.25/8,136
6. Step 6: Final answer
   x = 18,157.80