Finding the Third Proportional to 28,721.25 and 42,909.75

Step by Step Solution

1. Step 1: Write the proportion equation
   28,721.25 : 42,909.75 = 42,909.75 : x
2. Step 2: Convert to fraction form
   28,721.25/42,909.75 = 42,909.75/x
3. Step 3: Cross multiply
   28,721.25x = 42,909.75 × 42,909.75
4. Step 4: Simplify right side
   28,721.25x = 1,841,246,645.06
5. Step 5: Solve for x
   x = 1,841,246,645.06/28,721.25
6. Step 6: Final answer
   x = 64,107.47