Finding the Fourth Proportional to 3,456.71, 5,185.34 and 1,115.85

Step by Step Solution

1. Step 1: Write the proportion equation
   3,456.71 : 5,185.34 = 1,115.85 : x
2. Step 2: Convert to fraction form
   3,456.71/5,185.34 = 1,115.85/x
3. Step 3: Cross multiply
   3,456.71x = 5,185.34 × 1,115.85
4. Step 4: Simplify right side
   3,456.71x = 5,786,061.64
5. Step 5: Solve for x
   x = 5,786,061.64/3,456.71
6. Step 6: Final answer
   x = 1,673.86