Finding the Third Proportional to 393,789 and 858,847.50

Step by Step Solution

1. Step 1: Write the proportion equation
   393,789 : 858,847.50 = 858,847.50 : x
2. Step 2: Convert to fraction form
   393,789/858,847.50 = 858,847.50/x
3. Step 3: Cross multiply
   393,789x = 858,847.50 × 858,847.50
4. Step 4: Simplify right side
   393,789x = 737,619,028,256.25
5. Step 5: Solve for x
   x = 737,619,028,256.25/393,789
6. Step 6: Final answer
   x = 1,873,132.64