Finding the Third Proportional to 551,326 and 866,401.50

Step by Step Solution

1. Step 1: Write the proportion equation
   551,326 : 866,401.50 = 866,401.50 : x
2. Step 2: Convert to fraction form
   551,326/866,401.50 = 866,401.50/x
3. Step 3: Cross multiply
   551,326x = 866,401.50 × 866,401.50
4. Step 4: Simplify right side
   551,326x = 750,651,559,202.25
5. Step 5: Solve for x
   x = 750,651,559,202.25/551,326
6. Step 6: Final answer
   x = 1,361,538.47