Finding the Third Proportional to 42,819 and 56,815

Step by Step Solution

1. Step 1: Write the proportion equation
   42,819 : 56,815 = 56,815 : x
2. Step 2: Convert to fraction form
   42,819/56,815 = 56,815/x
3. Step 3: Cross multiply
   42,819x = 56,815 × 56,815
4. Step 4: Simplify right side
   42,819x = 3,227,944,225
5. Step 5: Solve for x
   x = 3,227,944,225/42,819
6. Step 6: Final answer
   x = 75,385.79