Finding the Third Proportional to 7,812.28 and 12,099.80

Step by Step Solution

1. Step 1: Write the proportion equation
   7,812.28 : 12,099.80 = 12,099.80 : x
2. Step 2: Convert to fraction form
   7,812.28/12,099.80 = 12,099.80/x
3. Step 3: Cross multiply
   7,812.28x = 12,099.80 × 12,099.80
4. Step 4: Simplify right side
   7,812.28x = 146,405,084.42
5. Step 5: Solve for x
   x = 146,405,084.42/7,812.28
6. Step 6: Final answer
   x = 18,740.38