Finding the Fourth Proportional to 2,084.48, 3,128.60 and 1,111.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,084.48 : 3,128.60 = 1,111.40 : x
2. Step 2: Convert to fraction form
   2,084.48/3,128.60 = 1,111.40/x
3. Step 3: Cross multiply
   2,084.48x = 3,128.60 × 1,111.40
4. Step 4: Simplify right side
   2,084.48x = 3,477,126.04
5. Step 5: Solve for x
   x = 3,477,126.04/2,084.48
6. Step 6: Final answer
   x = 1,668.10