Finding the Third Proportional to 64,460 and 139,990

Step by Step Solution

1. Step 1: Write the proportion equation
   64,460 : 139,990 = 139,990 : x
2. Step 2: Convert to fraction form
   64,460/139,990 = 139,990/x
3. Step 3: Cross multiply
   64,460x = 139,990 × 139,990
4. Step 4: Simplify right side
   64,460x = 19,597,200,100
5. Step 5: Solve for x
   x = 19,597,200,100/64,460
6. Step 6: Final answer
   x = 304,021.10