Finding the Third Proportional to 187,256 and 390,068

Step by Step Solution

1. Step 1: Write the proportion equation
   187,256 : 390,068 = 390,068 : x
2. Step 2: Convert to fraction form
   187,256/390,068 = 390,068/x
3. Step 3: Cross multiply
   187,256x = 390,068 × 390,068
4. Step 4: Simplify right side
   187,256x = 152,153,044,624
5. Step 5: Solve for x
   x = 152,153,044,624/187,256
6. Step 6: Final answer
   x = 812,540.29