Finding the Third Proportional to 57,709.13 and 86,563.69

Step by Step Solution

1. Step 1: Write the proportion equation
   57,709.13 : 86,563.69 = 86,563.69 : x
2. Step 2: Convert to fraction form
   57,709.13/86,563.69 = 86,563.69/x
3. Step 3: Cross multiply
   57,709.13x = 86,563.69 × 86,563.69
4. Step 4: Simplify right side
   57,709.13x = 7,493,271,993.60
5. Step 5: Solve for x
   x = 7,493,271,993.60/57,709.13
6. Step 6: Final answer
   x = 129,845.53