Finding the Third Proportional to 11,499.75 and 21,359

Step by Step Solution

1. Step 1: Write the proportion equation
   11,499.75 : 21,359 = 21,359 : x
2. Step 2: Convert to fraction form
   11,499.75/21,359 = 21,359/x
3. Step 3: Cross multiply
   11,499.75x = 21,359 × 21,359
4. Step 4: Simplify right side
   11,499.75x = 456,206,881
5. Step 5: Solve for x
   x = 456,206,881/11,499.75
6. Step 6: Final answer
   x = 39,671.03