Finding the Third Proportional to 551,394 and 843,310.50

Step by Step Solution

1. Step 1: Write the proportion equation
   551,394 : 843,310.50 = 843,310.50 : x
2. Step 2: Convert to fraction form
   551,394/843,310.50 = 843,310.50/x
3. Step 3: Cross multiply
   551,394x = 843,310.50 × 843,310.50
4. Step 4: Simplify right side
   551,394x = 711,172,599,410.25
5. Step 5: Solve for x
   x = 711,172,599,410.25/551,394
6. Step 6: Final answer
   x = 1,289,772.10