Finding the Third Proportional to 636,840 and 940,680

Step by Step Solution

1. Step 1: Write the proportion equation
   636,840 : 940,680 = 940,680 : x
2. Step 2: Convert to fraction form
   636,840/940,680 = 940,680/x
3. Step 3: Cross multiply
   636,840x = 940,680 × 940,680
4. Step 4: Simplify right side
   636,840x = 884,878,862,400
5. Step 5: Solve for x
   x = 884,878,862,400/636,840
6. Step 6: Final answer
   x = 1,389,483.80