Finding the Fourth Proportional to 3,420.91, 5,131.33 and 1,112.41

Step by Step Solution

1. Step 1: Write the proportion equation
   3,420.91 : 5,131.33 = 1,112.41 : x
2. Step 2: Convert to fraction form
   3,420.91/5,131.33 = 1,112.41/x
3. Step 3: Cross multiply
   3,420.91x = 5,131.33 × 1,112.41
4. Step 4: Simplify right side
   3,420.91x = 5,708,127.20
5. Step 5: Solve for x
   x = 5,708,127.20/3,420.91
6. Step 6: Final answer
   x = 1,668.60