Finding the Third Proportional to 57,831.75 and 86,265.75

Step by Step Solution

1. Step 1: Write the proportion equation
   57,831.75 : 86,265.75 = 86,265.75 : x
2. Step 2: Convert to fraction form
   57,831.75/86,265.75 = 86,265.75/x
3. Step 3: Cross multiply
   57,831.75x = 86,265.75 × 86,265.75
4. Step 4: Simplify right side
   57,831.75x = 7,441,779,623.06
5. Step 5: Solve for x
   x = 7,441,779,623.06/57,831.75
6. Step 6: Final answer
   x = 128,679.83