Finding the Third Proportional to 53,871.75 and 86,459.06

Step by Step Solution

1. Step 1: Write the proportion equation
   53,871.75 : 86,459.06 = 86,459.06 : x
2. Step 2: Convert to fraction form
   53,871.75/86,459.06 = 86,459.06/x
3. Step 3: Cross multiply
   53,871.75x = 86,459.06 × 86,459.06
4. Step 4: Simplify right side
   53,871.75x = 7,475,169,488.38
5. Step 5: Solve for x
   x = 7,475,169,488.38/53,871.75
6. Step 6: Final answer
   x = 138,758.62