Finding the Third Proportional to 300,787 and 401,391

Step by Step Solution

1. Step 1: Write the proportion equation
   300,787 : 401,391 = 401,391 : x
2. Step 2: Convert to fraction form
   300,787/401,391 = 401,391/x
3. Step 3: Cross multiply
   300,787x = 401,391 × 401,391
4. Step 4: Simplify right side
   300,787x = 161,114,734,881
5. Step 5: Solve for x
   x = 161,114,734,881/300,787
6. Step 6: Final answer
   x = 535,643.94