Finding the Third Proportional to 21,107.25 and 28,906.88

Step by Step Solution

1. Step 1: Write the proportion equation
   21,107.25 : 28,906.88 = 28,906.88 : x
2. Step 2: Convert to fraction form
   21,107.25/28,906.88 = 28,906.88/x
3. Step 3: Cross multiply
   21,107.25x = 28,906.88 × 28,906.88
4. Step 4: Simplify right side
   21,107.25x = 835,607,422.27
5. Step 5: Solve for x
   x = 835,607,422.27/21,107.25
6. Step 6: Final answer
   x = 39,588.64