Finding the Third Proportional to 42,240 and 90,720

Step by Step Solution

1. Step 1: Write the proportion equation
   42,240 : 90,720 = 90,720 : x
2. Step 2: Convert to fraction form
   42,240/90,720 = 90,720/x
3. Step 3: Cross multiply
   42,240x = 90,720 × 90,720
4. Step 4: Simplify right side
   42,240x = 8,230,118,400
5. Step 5: Solve for x
   x = 8,230,118,400/42,240
6. Step 6: Final answer
   x = 194,841.82