Finding the Third Proportional to 42,240 and 89,388

Step by Step Solution

1. Step 1: Write the proportion equation
   42,240 : 89,388 = 89,388 : x
2. Step 2: Convert to fraction form
   42,240/89,388 = 89,388/x
3. Step 3: Cross multiply
   42,240x = 89,388 × 89,388
4. Step 4: Simplify right side
   42,240x = 7,990,214,544
5. Step 5: Solve for x
   x = 7,990,214,544/42,240
6. Step 6: Final answer
   x = 189,162.28