Finding the Third Proportional to 290,410.50 and 629,078

Step by Step Solution

1. Step 1: Write the proportion equation
   290,410.50 : 629,078 = 629,078 : x
2. Step 2: Convert to fraction form
   290,410.50/629,078 = 629,078/x
3. Step 3: Cross multiply
   290,410.50x = 629,078 × 629,078
4. Step 4: Simplify right side
   290,410.50x = 395,739,130,084
5. Step 5: Solve for x
   x = 395,739,130,084/290,410.50
6. Step 6: Final answer
   x = 1,362,688.78