Finding the Third Proportional to 90,708 and 210,870

Step by Step Solution

1. Step 1: Write the proportion equation
   90,708 : 210,870 = 210,870 : x
2. Step 2: Convert to fraction form
   90,708/210,870 = 210,870/x
3. Step 3: Cross multiply
   90,708x = 210,870 × 210,870
4. Step 4: Simplify right side
   90,708x = 44,466,156,900
5. Step 5: Solve for x
   x = 44,466,156,900/90,708
6. Step 6: Final answer
   x = 490,212.08