Finding the Third Proportional to 424,082.25 and 623,403

Step by Step Solution

1. Step 1: Write the proportion equation
   424,082.25 : 623,403 = 623,403 : x
2. Step 2: Convert to fraction form
   424,082.25/623,403 = 623,403/x
3. Step 3: Cross multiply
   424,082.25x = 623,403 × 623,403
4. Step 4: Simplify right side
   424,082.25x = 388,631,300,409
5. Step 5: Solve for x
   x = 388,631,300,409/424,082.25
6. Step 6: Final answer
   x = 916,405.49