Finding the Third Proportional to 275,551.50 and 390,012.50

Step by Step Solution

1. Step 1: Write the proportion equation
   275,551.50 : 390,012.50 = 390,012.50 : x
2. Step 2: Convert to fraction form
   275,551.50/390,012.50 = 390,012.50/x
3. Step 3: Cross multiply
   275,551.50x = 390,012.50 × 390,012.50
4. Step 4: Simplify right side
   275,551.50x = 152,109,750,156.25
5. Step 5: Solve for x
   x = 152,109,750,156.25/275,551.50
6. Step 6: Final answer
   x = 552,019.31