Finding the Third Proportional to 66,993 and 139,499

Step by Step Solution

1. Step 1: Write the proportion equation
   66,993 : 139,499 = 139,499 : x
2. Step 2: Convert to fraction form
   66,993/139,499 = 139,499/x
3. Step 3: Cross multiply
   66,993x = 139,499 × 139,499
4. Step 4: Simplify right side
   66,993x = 19,459,971,001
5. Step 5: Solve for x
   x = 19,459,971,001/66,993
6. Step 6: Final answer
   x = 290,477.68