Finding the Third Proportional to 393,264 and 861,563.25

Step by Step Solution

1. Step 1: Write the proportion equation
   393,264 : 861,563.25 = 861,563.25 : x
2. Step 2: Convert to fraction form
   393,264/861,563.25 = 861,563.25/x
3. Step 3: Cross multiply
   393,264x = 861,563.25 × 861,563.25
4. Step 4: Simplify right side
   393,264x = 742,291,233,750.56
5. Step 5: Solve for x
   x = 742,291,233,750.56/393,264
6. Step 6: Final answer
   x = 1,887,513.82