Finding the Third Proportional to 56,906.50 and 86,142.50

Step by Step Solution

1. Step 1: Write the proportion equation
   56,906.50 : 86,142.50 = 86,142.50 : x
2. Step 2: Convert to fraction form
   56,906.50/86,142.50 = 86,142.50/x
3. Step 3: Cross multiply
   56,906.50x = 86,142.50 × 86,142.50
4. Step 4: Simplify right side
   56,906.50x = 7,420,530,306.25
5. Step 5: Solve for x
   x = 7,420,530,306.25/56,906.50
6. Step 6: Final answer
   x = 130,398.64