Finding the Third Proportional to 391,568 and 623,064

Step by Step Solution

1. Step 1: Write the proportion equation
   391,568 : 623,064 = 623,064 : x
2. Step 2: Convert to fraction form
   391,568/623,064 = 623,064/x
3. Step 3: Cross multiply
   391,568x = 623,064 × 623,064
4. Step 4: Simplify right side
   391,568x = 388,208,748,096
5. Step 5: Solve for x
   x = 388,208,748,096/391,568
6. Step 6: Final answer
   x = 991,421.03