Finding the Third Proportional to 42,240 and 56,868

Step by Step Solution

1. Step 1: Write the proportion equation
   42,240 : 56,868 = 56,868 : x
2. Step 2: Convert to fraction form
   42,240/56,868 = 56,868/x
3. Step 3: Cross multiply
   42,240x = 56,868 × 56,868
4. Step 4: Simplify right side
   42,240x = 3,233,969,424
5. Step 5: Solve for x
   x = 3,233,969,424/42,240
6. Step 6: Final answer
   x = 76,561.78