Finding the Third Proportional to 57,709.50 and 86,943.75

Step by Step Solution

1. Step 1: Write the proportion equation
   57,709.50 : 86,943.75 = 86,943.75 : x
2. Step 2: Convert to fraction form
   57,709.50/86,943.75 = 86,943.75/x
3. Step 3: Cross multiply
   57,709.50x = 86,943.75 × 86,943.75
4. Step 4: Simplify right side
   57,709.50x = 7,559,215,664.06
5. Step 5: Solve for x
   x = 7,559,215,664.06/57,709.50
6. Step 6: Final answer
   x = 130,987.37