Finding the Third Proportional to 402,270 and 554,128.50

Step by Step Solution

1. Step 1: Write the proportion equation
   402,270 : 554,128.50 = 554,128.50 : x
2. Step 2: Convert to fraction form
   402,270/554,128.50 = 554,128.50/x
3. Step 3: Cross multiply
   402,270x = 554,128.50 × 554,128.50
4. Step 4: Simplify right side
   402,270x = 307,058,394,512.25
5. Step 5: Solve for x
   x = 307,058,394,512.25/402,270
6. Step 6: Final answer
   x = 763,314.18