Finding the Third Proportional to 390,865.50 and 856,541.25

Step by Step Solution

1. Step 1: Write the proportion equation
   390,865.50 : 856,541.25 = 856,541.25 : x
2. Step 2: Convert to fraction form
   390,865.50/856,541.25 = 856,541.25/x
3. Step 3: Cross multiply
   390,865.50x = 856,541.25 × 856,541.25
4. Step 4: Simplify right side
   390,865.50x = 733,662,912,951.56
5. Step 5: Solve for x
   x = 733,662,912,951.56/390,865.50
6. Step 6: Final answer
   x = 1,877,021.41