Finding the Third Proportional to 15,563.81 and 21,618.56

Step by Step Solution

1. Step 1: Write the proportion equation
   15,563.81 : 21,618.56 = 21,618.56 : x
2. Step 2: Convert to fraction form
   15,563.81/21,618.56 = 21,618.56/x
3. Step 3: Cross multiply
   15,563.81x = 21,618.56 × 21,618.56
4. Step 4: Simplify right side
   15,563.81x = 467,362,244.57
5. Step 5: Solve for x
   x = 467,362,244.57/15,563.81
6. Step 6: Final answer
   x = 30,028.78