Finding the Fourth Proportional to 3,131.32, 4,697.82 and 939.88

Step by Step Solution

1. Step 1: Write the proportion equation
   3,131.32 : 4,697.82 = 939.88 : x
2. Step 2: Convert to fraction form
   3,131.32/4,697.82 = 939.88/x
3. Step 3: Cross multiply
   3,131.32x = 4,697.82 × 939.88
4. Step 4: Simplify right side
   3,131.32x = 4,415,387.06
5. Step 5: Solve for x
   x = 4,415,387.06/3,131.32
6. Step 6: Final answer
   x = 1,410.07