Finding the Third Proportional to 57,742.88 and 86,379.75

Step by Step Solution

1. Step 1: Write the proportion equation
   57,742.88 : 86,379.75 = 86,379.75 : x
2. Step 2: Convert to fraction form
   57,742.88/86,379.75 = 86,379.75/x
3. Step 3: Cross multiply
   57,742.88x = 86,379.75 × 86,379.75
4. Step 4: Simplify right side
   57,742.88x = 7,461,461,210.06
5. Step 5: Solve for x
   x = 7,461,461,210.06/57,742.88
6. Step 6: Final answer
   x = 129,218.73