Finding the Third Proportional to 21,870 and 40,986

Step by Step Solution

1. Step 1: Write the proportion equation
   21,870 : 40,986 = 40,986 : x
2. Step 2: Convert to fraction form
   21,870/40,986 = 40,986/x
3. Step 3: Cross multiply
   21,870x = 40,986 × 40,986
4. Step 4: Simplify right side
   21,870x = 1,679,852,196
5. Step 5: Solve for x
   x = 1,679,852,196/21,870
6. Step 6: Final answer
   x = 76,810.80