Finding the Third Proportional to 290,651 and 390,589.50

Step by Step Solution

1. Step 1: Write the proportion equation
   290,651 : 390,589.50 = 390,589.50 : x
2. Step 2: Convert to fraction form
   290,651/390,589.50 = 390,589.50/x
3. Step 3: Cross multiply
   290,651x = 390,589.50 × 390,589.50
4. Step 4: Simplify right side
   290,651x = 152,560,157,510.25
5. Step 5: Solve for x
   x = 152,560,157,510.25/290,651
6. Step 6: Final answer
   x = 524,891.22