Finding the Third Proportional to 126,300 and 210,478

Step by Step Solution

1. Step 1: Write the proportion equation
   126,300 : 210,478 = 210,478 : x
2. Step 2: Convert to fraction form
   126,300/210,478 = 210,478/x
3. Step 3: Cross multiply
   126,300x = 210,478 × 210,478
4. Step 4: Simplify right side
   126,300x = 44,300,988,484
5. Step 5: Solve for x
   x = 44,300,988,484/126,300
6. Step 6: Final answer
   x = 350,760.00