Finding the Third Proportional to 57,398 and 86,155

Step by Step Solution

1. Step 1: Write the proportion equation
   57,398 : 86,155 = 86,155 : x
2. Step 2: Convert to fraction form
   57,398/86,155 = 86,155/x
3. Step 3: Cross multiply
   57,398x = 86,155 × 86,155
4. Step 4: Simplify right side
   57,398x = 7,422,684,025
5. Step 5: Solve for x
   x = 7,422,684,025/57,398
6. Step 6: Final answer
   x = 129,319.56