Finding the Third Proportional to 275,590 and 390,066

Step by Step Solution

1. Step 1: Write the proportion equation
   275,590 : 390,066 = 390,066 : x
2. Step 2: Convert to fraction form
   275,590/390,066 = 390,066/x
3. Step 3: Cross multiply
   275,590x = 390,066 × 390,066
4. Step 4: Simplify right side
   275,590x = 152,151,484,356
5. Step 5: Solve for x
   x = 152,151,484,356/275,590
6. Step 6: Final answer
   x = 552,093.63