Finding the Fourth Proportional to 2,086.48, 3,131.60 and 1,113.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,086.48 : 3,131.60 = 1,113.40 : x
2. Step 2: Convert to fraction form
   2,086.48/3,131.60 = 1,113.40/x
3. Step 3: Cross multiply
   2,086.48x = 3,131.60 × 1,113.40
4. Step 4: Simplify right side
   2,086.48x = 3,486,723.44
5. Step 5: Solve for x
   x = 3,486,723.44/2,086.48
6. Step 6: Final answer
   x = 1,671.10