Finding the Fourth Proportional to 1,131.59, 1,696.33 and 438.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.59 : 1,696.33 = 438.71 : x
2. Step 2: Convert to fraction form
   1,131.59/1,696.33 = 438.71/x
3. Step 3: Cross multiply
   1,131.59x = 1,696.33 × 438.71
4. Step 4: Simplify right side
   1,131.59x = 744,198.03
5. Step 5: Solve for x
   x = 744,198.03/1,131.59
6. Step 6: Final answer
   x = 657.66