Finding the Third Proportional to 290,568 and 400,140

Step by Step Solution

1. Step 1: Write the proportion equation
   290,568 : 400,140 = 400,140 : x
2. Step 2: Convert to fraction form
   290,568/400,140 = 400,140/x
3. Step 3: Cross multiply
   290,568x = 400,140 × 400,140
4. Step 4: Simplify right side
   290,568x = 160,112,019,600
5. Step 5: Solve for x
   x = 160,112,019,600/290,568
6. Step 6: Final answer
   x = 551,031.15