Finding the Third Proportional to 68,372 and 99,870

Step by Step Solution

1. Step 1: Write the proportion equation
   68,372 : 99,870 = 99,870 : x
2. Step 2: Convert to fraction form
   68,372/99,870 = 99,870/x
3. Step 3: Cross multiply
   68,372x = 99,870 × 99,870
4. Step 4: Simplify right side
   68,372x = 9,974,016,900
5. Step 5: Solve for x
   x = 9,974,016,900/68,372
6. Step 6: Final answer
   x = 145,878.68