Finding the Third Proportional to 187,706 and 390,942

Step by Step Solution

1. Step 1: Write the proportion equation
   187,706 : 390,942 = 390,942 : x
2. Step 2: Convert to fraction form
   187,706/390,942 = 390,942/x
3. Step 3: Cross multiply
   187,706x = 390,942 × 390,942
4. Step 4: Simplify right side
   187,706x = 152,835,647,364
5. Step 5: Solve for x
   x = 152,835,647,364/187,706
6. Step 6: Final answer
   x = 814,228.89