Finding the Third Proportional to 551,631 and 857,680.50

Step by Step Solution

1. Step 1: Write the proportion equation
   551,631 : 857,680.50 = 857,680.50 : x
2. Step 2: Convert to fraction form
   551,631/857,680.50 = 857,680.50/x
3. Step 3: Cross multiply
   551,631x = 857,680.50 × 857,680.50
4. Step 4: Simplify right side
   551,631x = 735,615,840,080.25
5. Step 5: Solve for x
   x = 735,615,840,080.25/551,631
6. Step 6: Final answer
   x = 1,333,528.83