Finding the Third Proportional to 198,470 and 298,155

Step by Step Solution

1. Step 1: Write the proportion equation
   198,470 : 298,155 = 298,155 : x
2. Step 2: Convert to fraction form
   198,470/298,155 = 298,155/x
3. Step 3: Cross multiply
   198,470x = 298,155 × 298,155
4. Step 4: Simplify right side
   198,470x = 88,896,404,025
5. Step 5: Solve for x
   x = 88,896,404,025/198,470
6. Step 6: Final answer
   x = 447,908.52