Finding the Third Proportional to 312,151 and 685,061

Step by Step Solution

1. Step 1: Write the proportion equation
   312,151 : 685,061 = 685,061 : x
2. Step 2: Convert to fraction form
   312,151/685,061 = 685,061/x
3. Step 3: Cross multiply
   312,151x = 685,061 × 685,061
4. Step 4: Simplify right side
   312,151x = 469,308,573,721
5. Step 5: Solve for x
   x = 469,308,573,721/312,151
6. Step 6: Final answer
   x = 1,503,466.51