Finding the Fourth Proportional to 1,989.36, 2,980.92 and 1,111.08

Step by Step Solution

1. Step 1: Write the proportion equation
   1,989.36 : 2,980.92 = 1,111.08 : x
2. Step 2: Convert to fraction form
   1,989.36/2,980.92 = 1,111.08/x
3. Step 3: Cross multiply
   1,989.36x = 2,980.92 × 1,111.08
4. Step 4: Simplify right side
   1,989.36x = 3,312,040.59
5. Step 5: Solve for x
   x = 3,312,040.59/1,989.36
6. Step 6: Final answer
   x = 1,664.88