Finding the Third Proportional to 389,405 and 845,240.50

Step by Step Solution

1. Step 1: Write the proportion equation
   389,405 : 845,240.50 = 845,240.50 : x
2. Step 2: Convert to fraction form
   389,405/845,240.50 = 845,240.50/x
3. Step 3: Cross multiply
   389,405x = 845,240.50 × 845,240.50
4. Step 4: Simplify right side
   389,405x = 714,431,502,840.25
5. Step 5: Solve for x
   x = 714,431,502,840.25/389,405
6. Step 6: Final answer
   x = 1,834,674.70