Finding the Third Proportional to 64,620 and 139,424

Step by Step Solution

1. Step 1: Write the proportion equation
   64,620 : 139,424 = 139,424 : x
2. Step 2: Convert to fraction form
   64,620/139,424 = 139,424/x
3. Step 3: Cross multiply
   64,620x = 139,424 × 139,424
4. Step 4: Simplify right side
   64,620x = 19,439,051,776
5. Step 5: Solve for x
   x = 19,439,051,776/64,620
6. Step 6: Final answer
   x = 300,820.98