Finding the Third Proportional to 275,548.25 and 390,007.50

Step by Step Solution

1. Step 1: Write the proportion equation
   275,548.25 : 390,007.50 = 390,007.50 : x
2. Step 2: Convert to fraction form
   275,548.25/390,007.50 = 390,007.50/x
3. Step 3: Cross multiply
   275,548.25x = 390,007.50 × 390,007.50
4. Step 4: Simplify right side
   275,548.25x = 152,105,850,056.25
5. Step 5: Solve for x
   x = 152,105,850,056.25/275,548.25
6. Step 6: Final answer
   x = 552,011.67