Finding the Third Proportional to 90,389 and 187,947

Step by Step Solution

1. Step 1: Write the proportion equation
   90,389 : 187,947 = 187,947 : x
2. Step 2: Convert to fraction form
   90,389/187,947 = 187,947/x
3. Step 3: Cross multiply
   90,389x = 187,947 × 187,947
4. Step 4: Simplify right side
   90,389x = 35,324,074,809
5. Step 5: Solve for x
   x = 35,324,074,809/90,389
6. Step 6: Final answer
   x = 390,800.59