Finding the Third Proportional to 40,212 and 56,520

Step by Step Solution

1. Step 1: Write the proportion equation
   40,212 : 56,520 = 56,520 : x
2. Step 2: Convert to fraction form
   40,212/56,520 = 56,520/x
3. Step 3: Cross multiply
   40,212x = 56,520 × 56,520
4. Step 4: Simplify right side
   40,212x = 3,194,510,400
5. Step 5: Solve for x
   x = 3,194,510,400/40,212
6. Step 6: Final answer
   x = 79,441.72