Finding the Third Proportional to 275,589 and 390,064.50

Step by Step Solution

1. Step 1: Write the proportion equation
   275,589 : 390,064.50 = 390,064.50 : x
2. Step 2: Convert to fraction form
   275,589/390,064.50 = 390,064.50/x
3. Step 3: Cross multiply
   275,589x = 390,064.50 × 390,064.50
4. Step 4: Simplify right side
   275,589x = 152,150,314,160.25
5. Step 5: Solve for x
   x = 152,150,314,160.25/275,589
6. Step 6: Final answer
   x = 552,091.39