Finding the Third Proportional to 274,399.50 and 390,042

Step by Step Solution

1. Step 1: Write the proportion equation
   274,399.50 : 390,042 = 390,042 : x
2. Step 2: Convert to fraction form
   274,399.50/390,042 = 390,042/x
3. Step 3: Cross multiply
   274,399.50x = 390,042 × 390,042
4. Step 4: Simplify right side
   274,399.50x = 152,132,761,764
5. Step 5: Solve for x
   x = 152,132,761,764/274,399.50
6. Step 6: Final answer
   x = 554,420.70