Finding the Third Proportional to 9,318 and 12,451.50

Step by Step Solution

1. Step 1: Write the proportion equation
   9,318 : 12,451.50 = 12,451.50 : x
2. Step 2: Convert to fraction form
   9,318/12,451.50 = 12,451.50/x
3. Step 3: Cross multiply
   9,318x = 12,451.50 × 12,451.50
4. Step 4: Simplify right side
   9,318x = 155,039,852.25
5. Step 5: Solve for x
   x = 155,039,852.25/9,318
6. Step 6: Final answer
   x = 16,638.75