Finding the Third Proportional to 636,860 and 1,342,840

Step by Step Solution

1. Step 1: Write the proportion equation
   636,860 : 1,342,840 = 1,342,840 : x
2. Step 2: Convert to fraction form
   636,860/1,342,840 = 1,342,840/x
3. Step 3: Cross multiply
   636,860x = 1,342,840 × 1,342,840
4. Step 4: Simplify right side
   636,860x = 1,803,219,265,600
5. Step 5: Solve for x
   x = 1,803,219,265,600/636,860
6. Step 6: Final answer
   x = 2,831,421.77