Finding the Third Proportional to 393,424 and 857,986.50

Step by Step Solution

1. Step 1: Write the proportion equation
   393,424 : 857,986.50 = 857,986.50 : x
2. Step 2: Convert to fraction form
   393,424/857,986.50 = 857,986.50/x
3. Step 3: Cross multiply
   393,424x = 857,986.50 × 857,986.50
4. Step 4: Simplify right side
   393,424x = 736,140,834,182.25
5. Step 5: Solve for x
   x = 736,140,834,182.25/393,424
6. Step 6: Final answer
   x = 1,871,113.19