Finding the Third Proportional to 311,426 and 685,060

Step by Step Solution

1. Step 1: Write the proportion equation
   311,426 : 685,060 = 685,060 : x
2. Step 2: Convert to fraction form
   311,426/685,060 = 685,060/x
3. Step 3: Cross multiply
   311,426x = 685,060 × 685,060
4. Step 4: Simplify right side
   311,426x = 469,307,203,600
5. Step 5: Solve for x
   x = 469,307,203,600/311,426
6. Step 6: Final answer
   x = 1,506,962.18