Finding the Third Proportional to 11,119.50 and 21,210.75

Step by Step Solution

1. Step 1: Write the proportion equation
   11,119.50 : 21,210.75 = 21,210.75 : x
2. Step 2: Convert to fraction form
   11,119.50/21,210.75 = 21,210.75/x
3. Step 3: Cross multiply
   11,119.50x = 21,210.75 × 21,210.75
4. Step 4: Simplify right side
   11,119.50x = 449,895,915.56
5. Step 5: Solve for x
   x = 449,895,915.56/11,119.50
6. Step 6: Final answer
   x = 40,460.09