Finding the Third Proportional to 390,250.50 and 851,223

Step by Step Solution

1. Step 1: Write the proportion equation
   390,250.50 : 851,223 = 851,223 : x
2. Step 2: Convert to fraction form
   390,250.50/851,223 = 851,223/x
3. Step 3: Cross multiply
   390,250.50x = 851,223 × 851,223
4. Step 4: Simplify right side
   390,250.50x = 724,580,595,729
5. Step 5: Solve for x
   x = 724,580,595,729/390,250.50
6. Step 6: Final answer
   x = 1,856,706.39