Finding the Third Proportional to 390,932 and 856,602

Step by Step Solution

1. Step 1: Write the proportion equation
   390,932 : 856,602 = 856,602 : x
2. Step 2: Convert to fraction form
   390,932/856,602 = 856,602/x
3. Step 3: Cross multiply
   390,932x = 856,602 × 856,602
4. Step 4: Simplify right side
   390,932x = 733,766,986,404
5. Step 5: Solve for x
   x = 733,766,986,404/390,932
6. Step 6: Final answer
   x = 1,876,968.34