Finding the Third Proportional to 42,816 and 56,812

Step by Step Solution

1. Step 1: Write the proportion equation
   42,816 : 56,812 = 56,812 : x
2. Step 2: Convert to fraction form
   42,816/56,812 = 56,812/x
3. Step 3: Cross multiply
   42,816x = 56,812 × 56,812
4. Step 4: Simplify right side
   42,816x = 3,227,603,344
5. Step 5: Solve for x
   x = 3,227,603,344/42,816
6. Step 6: Final answer
   x = 75,383.11