Finding the Third Proportional to 10,218 and 21,528.75

Step by Step Solution

1. Step 1: Write the proportion equation
   10,218 : 21,528.75 = 21,528.75 : x
2. Step 2: Convert to fraction form
   10,218/21,528.75 = 21,528.75/x
3. Step 3: Cross multiply
   10,218x = 21,528.75 × 21,528.75
4. Step 4: Simplify right side
   10,218x = 463,487,076.56
5. Step 5: Solve for x
   x = 463,487,076.56/10,218
6. Step 6: Final answer
   x = 45,359.86