Finding the Third Proportional to 43,209 and 65,687

Step by Step Solution

1. Step 1: Write the proportion equation
   43,209 : 65,687 = 65,687 : x
2. Step 2: Convert to fraction form
   43,209/65,687 = 65,687/x
3. Step 3: Cross multiply
   43,209x = 65,687 × 65,687
4. Step 4: Simplify right side
   43,209x = 4,314,781,969
5. Step 5: Solve for x
   x = 4,314,781,969/43,209
6. Step 6: Final answer
   x = 99,858.41