Finding the Third Proportional to 390,104 and 851,649.50

Step by Step Solution

1. Step 1: Write the proportion equation
   390,104 : 851,649.50 = 851,649.50 : x
2. Step 2: Convert to fraction form
   390,104/851,649.50 = 851,649.50/x
3. Step 3: Cross multiply
   390,104x = 851,649.50 × 851,649.50
4. Step 4: Simplify right side
   390,104x = 725,306,870,850.25
5. Step 5: Solve for x
   x = 725,306,870,850.25/390,104
6. Step 6: Final answer
   x = 1,859,265.40