Finding the Third Proportional to 11,661.75 and 15,619.50

Step by Step Solution

1. Step 1: Write the proportion equation
   11,661.75 : 15,619.50 = 15,619.50 : x
2. Step 2: Convert to fraction form
   11,661.75/15,619.50 = 15,619.50/x
3. Step 3: Cross multiply
   11,661.75x = 15,619.50 × 15,619.50
4. Step 4: Simplify right side
   11,661.75x = 243,968,780.25
5. Step 5: Solve for x
   x = 243,968,780.25/11,661.75
6. Step 6: Final answer
   x = 20,920.43