Finding the Third Proportional to 399,610.50 and 856,221

Step by Step Solution

1. Step 1: Write the proportion equation
   399,610.50 : 856,221 = 856,221 : x
2. Step 2: Convert to fraction form
   399,610.50/856,221 = 856,221/x
3. Step 3: Cross multiply
   399,610.50x = 856,221 × 856,221
4. Step 4: Simplify right side
   399,610.50x = 733,114,400,841
5. Step 5: Solve for x
   x = 733,114,400,841/399,610.50
6. Step 6: Final answer
   x = 1,834,572.42