Finding the Third Proportional to 11,561.48 and 15,172.31

Step by Step Solution

1. Step 1: Write the proportion equation
   11,561.48 : 15,172.31 = 15,172.31 : x
2. Step 2: Convert to fraction form
   11,561.48/15,172.31 = 15,172.31/x
3. Step 3: Cross multiply
   11,561.48x = 15,172.31 × 15,172.31
4. Step 4: Simplify right side
   11,561.48x = 230,199,066.60
5. Step 5: Solve for x
   x = 230,199,066.60/11,561.48
6. Step 6: Final answer
   x = 19,910.86