Finding the Third Proportional to 65,200 and 142,080

Step by Step Solution

1. Step 1: Write the proportion equation
   65,200 : 142,080 = 142,080 : x
2. Step 2: Convert to fraction form
   65,200/142,080 = 142,080/x
3. Step 3: Cross multiply
   65,200x = 142,080 × 142,080
4. Step 4: Simplify right side
   65,200x = 20,186,726,400
5. Step 5: Solve for x
   x = 20,186,726,400/65,200
6. Step 6: Final answer
   x = 309,612.37