Finding the Fourth Proportional to 1,181.39, 1,771.61 and 359.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,181.39 : 1,771.61 = 359.37 : x
2. Step 2: Convert to fraction form
   1,181.39/1,771.61 = 359.37/x
3. Step 3: Cross multiply
   1,181.39x = 1,771.61 × 359.37
4. Step 4: Simplify right side
   1,181.39x = 636,661.69
5. Step 5: Solve for x
   x = 636,661.69/1,181.39
6. Step 6: Final answer
   x = 538.91