Finding the Third Proportional to 4,543.50 and 9,980.25

Step by Step Solution

1. Step 1: Write the proportion equation
   4,543.50 : 9,980.25 = 9,980.25 : x
2. Step 2: Convert to fraction form
   4,543.50/9,980.25 = 9,980.25/x
3. Step 3: Cross multiply
   4,543.50x = 9,980.25 × 9,980.25
4. Step 4: Simplify right side
   4,543.50x = 99,605,390.06
5. Step 5: Solve for x
   x = 99,605,390.06/4,543.50
6. Step 6: Final answer
   x = 21,922.61