Finding the Third Proportional to 275,574 and 390,046.50

Step by Step Solution

1. Step 1: Write the proportion equation
   275,574 : 390,046.50 = 390,046.50 : x
2. Step 2: Convert to fraction form
   275,574/390,046.50 = 390,046.50/x
3. Step 3: Cross multiply
   275,574x = 390,046.50 × 390,046.50
4. Step 4: Simplify right side
   275,574x = 152,136,272,162.25
5. Step 5: Solve for x
   x = 152,136,272,162.25/275,574
6. Step 6: Final answer
   x = 552,070.49