Finding the Third Proportional to 623,560 and 891,740

Step by Step Solution

1. Step 1: Write the proportion equation
   623,560 : 891,740 = 891,740 : x
2. Step 2: Convert to fraction form
   623,560/891,740 = 891,740/x
3. Step 3: Cross multiply
   623,560x = 891,740 × 891,740
4. Step 4: Simplify right side
   623,560x = 795,200,227,600
5. Step 5: Solve for x
   x = 795,200,227,600/623,560
6. Step 6: Final answer
   x = 1,275,258.56