Finding the Third Proportional to 10,478.43 and 21,418.17

Step by Step Solution

1. Step 1: Write the proportion equation
   10,478.43 : 21,418.17 = 21,418.17 : x
2. Step 2: Convert to fraction form
   10,478.43/21,418.17 = 21,418.17/x
3. Step 3: Cross multiply
   10,478.43x = 21,418.17 × 21,418.17
4. Step 4: Simplify right side
   10,478.43x = 458,738,086.47
5. Step 5: Solve for x
   x = 458,738,086.47/10,478.43
6. Step 6: Final answer
   x = 43,779.29