Finding the Third Proportional to 64,858 and 142,018

Step by Step Solution

1. Step 1: Write the proportion equation
   64,858 : 142,018 = 142,018 : x
2. Step 2: Convert to fraction form
   64,858/142,018 = 142,018/x
3. Step 3: Cross multiply
   64,858x = 142,018 × 142,018
4. Step 4: Simplify right side
   64,858x = 20,169,112,324
5. Step 5: Solve for x
   x = 20,169,112,324/64,858
6. Step 6: Final answer
   x = 310,973.39