Finding the Third Proportional to 61,215.75 and 86,649.75

Step by Step Solution

1. Step 1: Write the proportion equation
   61,215.75 : 86,649.75 = 86,649.75 : x
2. Step 2: Convert to fraction form
   61,215.75/86,649.75 = 86,649.75/x
3. Step 3: Cross multiply
   61,215.75x = 86,649.75 × 86,649.75
4. Step 4: Simplify right side
   61,215.75x = 7,508,179,175.06
5. Step 5: Solve for x
   x = 7,508,179,175.06/61,215.75
6. Step 6: Final answer
   x = 122,651.10