Finding the Third Proportional to 399,697 and 856,373.50

Step by Step Solution

1. Step 1: Write the proportion equation
   399,697 : 856,373.50 = 856,373.50 : x
2. Step 2: Convert to fraction form
   399,697/856,373.50 = 856,373.50/x
3. Step 3: Cross multiply
   399,697x = 856,373.50 × 856,373.50
4. Step 4: Simplify right side
   399,697x = 733,375,571,502.25
5. Step 5: Solve for x
   x = 733,375,571,502.25/399,697
6. Step 6: Final answer
   x = 1,834,828.81