Finding the Third Proportional to 9,856.69 and 20,386.69

Step by Step Solution

1. Step 1: Write the proportion equation
   9,856.69 : 20,386.69 = 20,386.69 : x
2. Step 2: Convert to fraction form
   9,856.69/20,386.69 = 20,386.69/x
3. Step 3: Cross multiply
   9,856.69x = 20,386.69 × 20,386.69
4. Step 4: Simplify right side
   9,856.69x = 415,617,027.22
5. Step 5: Solve for x
   x = 415,617,027.22/9,856.69
6. Step 6: Final answer
   x = 42,165.99