Finding the Third Proportional to 16,618.50 and 21,556.13

Step by Step Solution

1. Step 1: Write the proportion equation
   16,618.50 : 21,556.13 = 21,556.13 : x
2. Step 2: Convert to fraction form
   16,618.50/21,556.13 = 21,556.13/x
3. Step 3: Cross multiply
   16,618.50x = 21,556.13 × 21,556.13
4. Step 4: Simplify right side
   16,618.50x = 464,666,525.02
5. Step 5: Solve for x
   x = 464,666,525.02/16,618.50
6. Step 6: Final answer
   x = 27,960.80