Finding the Third Proportional to 42,240 and 57,600

Step by Step Solution

1. Step 1: Write the proportion equation
   42,240 : 57,600 = 57,600 : x
2. Step 2: Convert to fraction form
   42,240/57,600 = 57,600/x
3. Step 3: Cross multiply
   42,240x = 57,600 × 57,600
4. Step 4: Simplify right side
   42,240x = 3,317,760,000
5. Step 5: Solve for x
   x = 3,317,760,000/42,240
6. Step 6: Final answer
   x = 78,545.45