Finding the Fourth Proportional to 3,381.31, 5,072.78 and 1,072.81

Step by Step Solution

1. Step 1: Write the proportion equation
   3,381.31 : 5,072.78 = 1,072.81 : x
2. Step 2: Convert to fraction form
   3,381.31/5,072.78 = 1,072.81/x
3. Step 3: Cross multiply
   3,381.31x = 5,072.78 × 1,072.81
4. Step 4: Simplify right side
   3,381.31x = 5,442,129.11
5. Step 5: Solve for x
   x = 5,442,129.11/3,381.31
6. Step 6: Final answer
   x = 1,609.47