Finding the Third Proportional to 390,930 and 856,594.50

Step by Step Solution

1. Step 1: Write the proportion equation
   390,930 : 856,594.50 = 856,594.50 : x
2. Step 2: Convert to fraction form
   390,930/856,594.50 = 856,594.50/x
3. Step 3: Cross multiply
   390,930x = 856,594.50 × 856,594.50
4. Step 4: Simplify right side
   390,930x = 733,754,137,430.25
5. Step 5: Solve for x
   x = 733,754,137,430.25/390,930
6. Step 6: Final answer
   x = 1,876,945.07