Finding the Third Proportional to 399,613.50 and 856,084.50

Step by Step Solution

1. Step 1: Write the proportion equation
   399,613.50 : 856,084.50 = 856,084.50 : x
2. Step 2: Convert to fraction form
   399,613.50/856,084.50 = 856,084.50/x
3. Step 3: Cross multiply
   399,613.50x = 856,084.50 × 856,084.50
4. Step 4: Simplify right side
   399,613.50x = 732,880,671,140.25
5. Step 5: Solve for x
   x = 732,880,671,140.25/399,613.50
6. Step 6: Final answer
   x = 1,833,973.75