Finding the Fourth Proportional to 518,441, 715,448.59 and 279,977

Step by Step Solution

1. Step 1: Write the proportion equation
   518,441 : 715,448.59 = 279,977 : x
2. Step 2: Convert to fraction form
   518,441/715,448.59 = 279,977/x
3. Step 3: Cross multiply
   518,441x = 715,448.59 × 279,977
4. Step 4: Simplify right side
   518,441x = 200,309,149,882.43
5. Step 5: Solve for x
   x = 200,309,149,882.43/518,441
6. Step 6: Final answer
   x = 386,368.27