Finding the Third Proportional to 390,069 and 579,150

Step by Step Solution

1. Step 1: Write the proportion equation
   390,069 : 579,150 = 579,150 : x
2. Step 2: Convert to fraction form
   390,069/579,150 = 579,150/x
3. Step 3: Cross multiply
   390,069x = 579,150 × 579,150
4. Step 4: Simplify right side
   390,069x = 335,414,722,500
5. Step 5: Solve for x
   x = 335,414,722,500/390,069
6. Step 6: Final answer
   x = 859,885.62