Finding the Third Proportional to 90,970 and 199,800

Step by Step Solution

1. Step 1: Write the proportion equation
   90,970 : 199,800 = 199,800 : x
2. Step 2: Convert to fraction form
   90,970/199,800 = 199,800/x
3. Step 3: Cross multiply
   90,970x = 199,800 × 199,800
4. Step 4: Simplify right side
   90,970x = 39,920,040,000
5. Step 5: Solve for x
   x = 39,920,040,000/90,970
6. Step 6: Final answer
   x = 438,826.43