Finding the Third Proportional to 103,689 and 140,699

Step by Step Solution

1. Step 1: Write the proportion equation
   103,689 : 140,699 = 140,699 : x
2. Step 2: Convert to fraction form
   103,689/140,699 = 140,699/x
3. Step 3: Cross multiply
   103,689x = 140,699 × 140,699
4. Step 4: Simplify right side
   103,689x = 19,796,208,601
5. Step 5: Solve for x
   x = 19,796,208,601/103,689
6. Step 6: Final answer
   x = 190,919.08