Finding the Third Proportional to 239,142 and 359,280

Step by Step Solution

1. Step 1: Write the proportion equation
   239,142 : 359,280 = 359,280 : x
2. Step 2: Convert to fraction form
   239,142/359,280 = 359,280/x
3. Step 3: Cross multiply
   239,142x = 359,280 × 359,280
4. Step 4: Simplify right side
   239,142x = 129,082,118,400
5. Step 5: Solve for x
   x = 129,082,118,400/239,142
6. Step 6: Final answer
   x = 539,771.84