Finding the Third Proportional to 403,784 and 626,978

Step by Step Solution

1. Step 1: Write the proportion equation
   403,784 : 626,978 = 626,978 : x
2. Step 2: Convert to fraction form
   403,784/626,978 = 626,978/x
3. Step 3: Cross multiply
   403,784x = 626,978 × 626,978
4. Step 4: Simplify right side
   403,784x = 393,101,412,484
5. Step 5: Solve for x
   x = 393,101,412,484/403,784
6. Step 6: Final answer
   x = 973,543.81