Finding the Third Proportional to 399,584 and 856,030

Step by Step Solution

1. Step 1: Write the proportion equation
   399,584 : 856,030 = 856,030 : x
2. Step 2: Convert to fraction form
   399,584/856,030 = 856,030/x
3. Step 3: Cross multiply
   399,584x = 856,030 × 856,030
4. Step 4: Simplify right side
   399,584x = 732,787,360,900
5. Step 5: Solve for x
   x = 732,787,360,900/399,584
6. Step 6: Final answer
   x = 1,833,875.63