Finding the Fourth Proportional to 3,128.82, 4,691.85 and 937.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,128.82 : 4,691.85 = 937.72 : x
2. Step 2: Convert to fraction form
   3,128.82/4,691.85 = 937.72/x
3. Step 3: Cross multiply
   3,128.82x = 4,691.85 × 937.72
4. Step 4: Simplify right side
   3,128.82x = 4,399,641.58
5. Step 5: Solve for x
   x = 4,399,641.58/3,128.82
6. Step 6: Final answer
   x = 1,406.17