Finding the Fourth Proportional to 538,282.69, 743,139.39 and 357,240.10

Step by Step Solution

1. Step 1: Write the proportion equation
   538,282.69 : 743,139.39 = 357,240.10 : x
2. Step 2: Convert to fraction form
   538,282.69/743,139.39 = 357,240.10/x
3. Step 3: Cross multiply
   538,282.69x = 743,139.39 × 357,240.10
4. Step 4: Simplify right side
   538,282.69x = 265,479,185,768.43
5. Step 5: Solve for x
   x = 265,479,185,768.43/538,282.69
6. Step 6: Final answer
   x = 493,196.59