Finding the Fourth Proportional to 3,131.47, 4,696.69 and 939.81

Step by Step Solution

1. Step 1: Write the proportion equation
   3,131.47 : 4,696.69 = 939.81 : x
2. Step 2: Convert to fraction form
   3,131.47/4,696.69 = 939.81/x
3. Step 3: Cross multiply
   3,131.47x = 4,696.69 × 939.81
4. Step 4: Simplify right side
   3,131.47x = 4,413,999.75
5. Step 5: Solve for x
   x = 4,413,999.75/3,131.47
6. Step 6: Final answer
   x = 1,409.56