Finding the Third Proportional to 42,686 and 57,115

Step by Step Solution

1. Step 1: Write the proportion equation
   42,686 : 57,115 = 57,115 : x
2. Step 2: Convert to fraction form
   42,686/57,115 = 57,115/x
3. Step 3: Cross multiply
   42,686x = 57,115 × 57,115
4. Step 4: Simplify right side
   42,686x = 3,262,123,225
5. Step 5: Solve for x
   x = 3,262,123,225/42,686
6. Step 6: Final answer
   x = 76,421.38