Finding the Third Proportional to 64,870 and 138,110

Step by Step Solution

1. Step 1: Write the proportion equation
   64,870 : 138,110 = 138,110 : x
2. Step 2: Convert to fraction form
   64,870/138,110 = 138,110/x
3. Step 3: Cross multiply
   64,870x = 138,110 × 138,110
4. Step 4: Simplify right side
   64,870x = 19,074,372,100
5. Step 5: Solve for x
   x = 19,074,372,100/64,870
6. Step 6: Final answer
   x = 294,039.96