Finding the Third Proportional to 60,298 and 128,900

Step by Step Solution

1. Step 1: Write the proportion equation
   60,298 : 128,900 = 128,900 : x
2. Step 2: Convert to fraction form
   60,298/128,900 = 128,900/x
3. Step 3: Cross multiply
   60,298x = 128,900 × 128,900
4. Step 4: Simplify right side
   60,298x = 16,615,210,000
5. Step 5: Solve for x
   x = 16,615,210,000/60,298
6. Step 6: Final answer
   x = 275,551.59