Finding the Third Proportional to 21,060 and 42,727.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,060 : 42,727.50 = 42,727.50 : x
2. Step 2: Convert to fraction form
   21,060/42,727.50 = 42,727.50/x
3. Step 3: Cross multiply
   21,060x = 42,727.50 × 42,727.50
4. Step 4: Simplify right side
   21,060x = 1,825,639,256.25
5. Step 5: Solve for x
   x = 1,825,639,256.25/21,060
6. Step 6: Final answer
   x = 86,687.52