Finding the Third Proportional to 56,139 and 86,760

Step by Step Solution

1. Step 1: Write the proportion equation
   56,139 : 86,760 = 86,760 : x
2. Step 2: Convert to fraction form
   56,139/86,760 = 86,760/x
3. Step 3: Cross multiply
   56,139x = 86,760 × 86,760
4. Step 4: Simplify right side
   56,139x = 7,527,297,600
5. Step 5: Solve for x
   x = 7,527,297,600/56,139
6. Step 6: Final answer
   x = 134,083.21