Finding the Third Proportional to 90,040 and 208,450

Step by Step Solution

1. Step 1: Write the proportion equation
   90,040 : 208,450 = 208,450 : x
2. Step 2: Convert to fraction form
   90,040/208,450 = 208,450/x
3. Step 3: Cross multiply
   90,040x = 208,450 × 208,450
4. Step 4: Simplify right side
   90,040x = 43,451,402,500
5. Step 5: Solve for x
   x = 43,451,402,500/90,040
6. Step 6: Final answer
   x = 482,578.88