Finding the Third Proportional to 393,605.89 and 858,434.52

Step by Step Solution

1. Step 1: Write the proportion equation
   393,605.89 : 858,434.52 = 858,434.52 : x
2. Step 2: Convert to fraction form
   393,605.89/858,434.52 = 858,434.52/x
3. Step 3: Cross multiply
   393,605.89x = 858,434.52 × 858,434.52
4. Step 4: Simplify right side
   393,605.89x = 736,909,824,322.85
5. Step 5: Solve for x
   x = 736,909,824,322.85/393,605.89
6. Step 6: Final answer
   x = 1,872,202.21