Finding the Third Proportional to 275,622 and 390,106.50

Step by Step Solution

1. Step 1: Write the proportion equation
   275,622 : 390,106.50 = 390,106.50 : x
2. Step 2: Convert to fraction form
   275,622/390,106.50 = 390,106.50/x
3. Step 3: Cross multiply
   275,622x = 390,106.50 × 390,106.50
4. Step 4: Simplify right side
   275,622x = 152,183,081,342.25
5. Step 5: Solve for x
   x = 152,183,081,342.25/275,622
6. Step 6: Final answer
   x = 552,144.17