Finding the Third Proportional to 201,390 and 282,300

Step by Step Solution

1. Step 1: Write the proportion equation
   201,390 : 282,300 = 282,300 : x
2. Step 2: Convert to fraction form
   201,390/282,300 = 282,300/x
3. Step 3: Cross multiply
   201,390x = 282,300 × 282,300
4. Step 4: Simplify right side
   201,390x = 79,693,290,000
5. Step 5: Solve for x
   x = 79,693,290,000/201,390
6. Step 6: Final answer
   x = 395,716.22