Finding the Third Proportional to 290,401.88 and 426,078.56

Step by Step Solution

1. Step 1: Write the proportion equation
   290,401.88 : 426,078.56 = 426,078.56 : x
2. Step 2: Convert to fraction form
   290,401.88/426,078.56 = 426,078.56/x
3. Step 3: Cross multiply
   290,401.88x = 426,078.56 × 426,078.56
4. Step 4: Simplify right side
   290,401.88x = 181,542,941,422.07
5. Step 5: Solve for x
   x = 181,542,941,422.07/290,401.88
6. Step 6: Final answer
   x = 625,143.83