Finding the Third Proportional to 64,690.50 and 138,831

Step by Step Solution

1. Step 1: Write the proportion equation
   64,690.50 : 138,831 = 138,831 : x
2. Step 2: Convert to fraction form
   64,690.50/138,831 = 138,831/x
3. Step 3: Cross multiply
   64,690.50x = 138,831 × 138,831
4. Step 4: Simplify right side
   64,690.50x = 19,274,046,561
5. Step 5: Solve for x
   x = 19,274,046,561/64,690.50
6. Step 6: Final answer
   x = 297,942.46