Finding the Third Proportional to 390,112.50 and 851,667

Step by Step Solution

1. Step 1: Write the proportion equation
   390,112.50 : 851,667 = 851,667 : x
2. Step 2: Convert to fraction form
   390,112.50/851,667 = 851,667/x
3. Step 3: Cross multiply
   390,112.50x = 851,667 × 851,667
4. Step 4: Simplify right side
   390,112.50x = 725,336,678,889
5. Step 5: Solve for x
   x = 725,336,678,889/390,112.50
6. Step 6: Final answer
   x = 1,859,301.30