Finding the Third Proportional to 275,610 and 390,091.50

Step by Step Solution

1. Step 1: Write the proportion equation
   275,610 : 390,091.50 = 390,091.50 : x
2. Step 2: Convert to fraction form
   275,610/390,091.50 = 390,091.50/x
3. Step 3: Cross multiply
   275,610x = 390,091.50 × 390,091.50
4. Step 4: Simplify right side
   275,610x = 152,171,378,372.25
5. Step 5: Solve for x
   x = 152,171,378,372.25/275,610
6. Step 6: Final answer
   x = 552,125.75