Finding the Third Proportional to 18,969.19 and 21,520.69

Step by Step Solution

1. Step 1: Write the proportion equation
   18,969.19 : 21,520.69 = 21,520.69 : x
2. Step 2: Convert to fraction form
   18,969.19/21,520.69 = 21,520.69/x
3. Step 3: Cross multiply
   18,969.19x = 21,520.69 × 21,520.69
4. Step 4: Simplify right side
   18,969.19x = 463,139,990.47
5. Step 5: Solve for x
   x = 463,139,990.47/18,969.19
6. Step 6: Final answer
   x = 24,415.38