Finding the Third Proportional to 11,173.50 and 21,091.50

Step by Step Solution

1. Step 1: Write the proportion equation
   11,173.50 : 21,091.50 = 21,091.50 : x
2. Step 2: Convert to fraction form
   11,173.50/21,091.50 = 21,091.50/x
3. Step 3: Cross multiply
   11,173.50x = 21,091.50 × 21,091.50
4. Step 4: Simplify right side
   11,173.50x = 444,851,372.25
5. Step 5: Solve for x
   x = 444,851,372.25/11,173.50
6. Step 6: Final answer
   x = 39,813.07