Finding the Third Proportional to 90,078 and 191,820

Step by Step Solution

1. Step 1: Write the proportion equation
   90,078 : 191,820 = 191,820 : x
2. Step 2: Convert to fraction form
   90,078/191,820 = 191,820/x
3. Step 3: Cross multiply
   90,078x = 191,820 × 191,820
4. Step 4: Simplify right side
   90,078x = 36,794,912,400
5. Step 5: Solve for x
   x = 36,794,912,400/90,078
6. Step 6: Final answer
   x = 408,478.35