Finding the Fourth Proportional to 709,401.43, 978,994.74 and 387,132.30

Step by Step Solution

1. Step 1: Write the proportion equation
   709,401.43 : 978,994.74 = 387,132.30 : x
2. Step 2: Convert to fraction form
   709,401.43/978,994.74 = 387,132.30/x
3. Step 3: Cross multiply
   709,401.43x = 978,994.74 × 387,132.30
4. Step 4: Simplify right side
   709,401.43x = 379,000,485,384.10
5. Step 5: Solve for x
   x = 379,000,485,384.10/709,401.43
6. Step 6: Final answer
   x = 534,253.91