Finding the Third Proportional to 142,485 and 300,990

Step by Step Solution

1. Step 1: Write the proportion equation
   142,485 : 300,990 = 300,990 : x
2. Step 2: Convert to fraction form
   142,485/300,990 = 300,990/x
3. Step 3: Cross multiply
   142,485x = 300,990 × 300,990
4. Step 4: Simplify right side
   142,485x = 90,594,980,100
5. Step 5: Solve for x
   x = 90,594,980,100/142,485
6. Step 6: Final answer
   x = 635,821.17