Finding the Third Proportional to 10,428.75 and 21,720.38

Step by Step Solution

1. Step 1: Write the proportion equation
   10,428.75 : 21,720.38 = 21,720.38 : x
2. Step 2: Convert to fraction form
   10,428.75/21,720.38 = 21,720.38/x
3. Step 3: Cross multiply
   10,428.75x = 21,720.38 × 21,720.38
4. Step 4: Simplify right side
   10,428.75x = 471,774,690.14
5. Step 5: Solve for x
   x = 471,774,690.14/10,428.75
6. Step 6: Final answer
   x = 45,237.89