Finding the Third Proportional to 290,716.50 and 623,460

Step by Step Solution

1. Step 1: Write the proportion equation
   290,716.50 : 623,460 = 623,460 : x
2. Step 2: Convert to fraction form
   290,716.50/623,460 = 623,460/x
3. Step 3: Cross multiply
   290,716.50x = 623,460 × 623,460
4. Step 4: Simplify right side
   290,716.50x = 388,702,371,600
5. Step 5: Solve for x
   x = 388,702,371,600/290,716.50
6. Step 6: Final answer
   x = 1,337,049.57