Finding the Third Proportional to 9,720 and 21,055.50

Step by Step Solution

1. Step 1: Write the proportion equation
   9,720 : 21,055.50 = 21,055.50 : x
2. Step 2: Convert to fraction form
   9,720/21,055.50 = 21,055.50/x
3. Step 3: Cross multiply
   9,720x = 21,055.50 × 21,055.50
4. Step 4: Simplify right side
   9,720x = 443,334,080.25
5. Step 5: Solve for x
   x = 443,334,080.25/9,720
6. Step 6: Final answer
   x = 45,610.50