Finding the Third Proportional to 275,592 and 390,066.75

Step by Step Solution

1. Step 1: Write the proportion equation
   275,592 : 390,066.75 = 390,066.75 : x
2. Step 2: Convert to fraction form
   275,592/390,066.75 = 390,066.75/x
3. Step 3: Cross multiply
   275,592x = 390,066.75 × 390,066.75
4. Step 4: Simplify right side
   275,592x = 152,152,069,455.56
5. Step 5: Solve for x
   x = 152,152,069,455.56/275,592
6. Step 6: Final answer
   x = 552,091.75