Finding the Third Proportional to 87,518 and 191,980

Step by Step Solution

1. Step 1: Write the proportion equation
   87,518 : 191,980 = 191,980 : x
2. Step 2: Convert to fraction form
   87,518/191,980 = 191,980/x
3. Step 3: Cross multiply
   87,518x = 191,980 × 191,980
4. Step 4: Simplify right side
   87,518x = 36,856,320,400
5. Step 5: Solve for x
   x = 36,856,320,400/87,518
6. Step 6: Final answer
   x = 421,128.46