Finding the Third Proportional to 389,430 and 841,138.50

Step by Step Solution

1. Step 1: Write the proportion equation
   389,430 : 841,138.50 = 841,138.50 : x
2. Step 2: Convert to fraction form
   389,430/841,138.50 = 841,138.50/x
3. Step 3: Cross multiply
   389,430x = 841,138.50 × 841,138.50
4. Step 4: Simplify right side
   389,430x = 707,513,976,182.25
5. Step 5: Solve for x
   x = 707,513,976,182.25/389,430
6. Step 6: Final answer
   x = 1,816,793.71