Finding the Third Proportional to 290,593.50 and 390,510

Step by Step Solution

1. Step 1: Write the proportion equation
   290,593.50 : 390,510 = 390,510 : x
2. Step 2: Convert to fraction form
   290,593.50/390,510 = 390,510/x
3. Step 3: Cross multiply
   290,593.50x = 390,510 × 390,510
4. Step 4: Simplify right side
   290,593.50x = 152,498,060,100
5. Step 5: Solve for x
   x = 152,498,060,100/290,593.50
6. Step 6: Final answer
   x = 524,781.39