Finding the Fourth Proportional to 2,084.99, 3,128.79 and 1,111.73

Step by Step Solution

1. Step 1: Write the proportion equation
   2,084.99 : 3,128.79 = 1,111.73 : x
2. Step 2: Convert to fraction form
   2,084.99/3,128.79 = 1,111.73/x
3. Step 3: Cross multiply
   2,084.99x = 3,128.79 × 1,111.73
4. Step 4: Simplify right side
   2,084.99x = 3,478,369.71
5. Step 5: Solve for x
   x = 3,478,369.71/2,084.99
6. Step 6: Final answer
   x = 1,668.29