Finding the Fourth Proportional to 1,990.50, 2,984.94 and 1,112.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,990.50 : 2,984.94 = 1,112.88 : x
2. Step 2: Convert to fraction form
   1,990.50/2,984.94 = 1,112.88/x
3. Step 3: Cross multiply
   1,990.50x = 2,984.94 × 1,112.88
4. Step 4: Simplify right side
   1,990.50x = 3,321,880.03
5. Step 5: Solve for x
   x = 3,321,880.03/1,990.50
6. Step 6: Final answer
   x = 1,668.87