Finding the Third Proportional to 10,099.69 and 20,700.56

Step by Step Solution

1. Step 1: Write the proportion equation
   10,099.69 : 20,700.56 = 20,700.56 : x
2. Step 2: Convert to fraction form
   10,099.69/20,700.56 = 20,700.56/x
3. Step 3: Cross multiply
   10,099.69x = 20,700.56 × 20,700.56
4. Step 4: Simplify right side
   10,099.69x = 428,513,287.82
5. Step 5: Solve for x
   x = 428,513,287.82/10,099.69
6. Step 6: Final answer
   x = 42,428.37