Finding the Fourth Proportional to 457,025.57, 685,131.82 and 216,991.39

Step by Step Solution

1. Step 1: Write the proportion equation
   457,025.57 : 685,131.82 = 216,991.39 : x
2. Step 2: Convert to fraction form
   457,025.57/685,131.82 = 216,991.39/x
3. Step 3: Cross multiply
   457,025.57x = 685,131.82 × 216,991.39
4. Step 4: Simplify right side
   457,025.57x = 148,667,703,699.72
5. Step 5: Solve for x
   x = 148,667,703,699.72/457,025.57
6. Step 6: Final answer
   x = 325,294.06