Finding the Third Proportional to 81,990 and 180,030

Step by Step Solution

1. Step 1: Write the proportion equation
   81,990 : 180,030 = 180,030 : x
2. Step 2: Convert to fraction form
   81,990/180,030 = 180,030/x
3. Step 3: Cross multiply
   81,990x = 180,030 × 180,030
4. Step 4: Simplify right side
   81,990x = 32,410,800,900
5. Step 5: Solve for x
   x = 32,410,800,900/81,990
6. Step 6: Final answer
   x = 395,301.88