Finding the Third Proportional to 57,718.50 and 86,347.50

Step by Step Solution

1. Step 1: Write the proportion equation
   57,718.50 : 86,347.50 = 86,347.50 : x
2. Step 2: Convert to fraction form
   57,718.50/86,347.50 = 86,347.50/x
3. Step 3: Cross multiply
   57,718.50x = 86,347.50 × 86,347.50
4. Step 4: Simplify right side
   57,718.50x = 7,455,890,756.25
5. Step 5: Solve for x
   x = 7,455,890,756.25/57,718.50
6. Step 6: Final answer
   x = 129,176.79