Finding the Fourth Proportional to 3,668.78, 5,062.89 and 1,990.23

Step by Step Solution

1. Step 1: Write the proportion equation
   3,668.78 : 5,062.89 = 1,990.23 : x
2. Step 2: Convert to fraction form
   3,668.78/5,062.89 = 1,990.23/x
3. Step 3: Cross multiply
   3,668.78x = 5,062.89 × 1,990.23
4. Step 4: Simplify right side
   3,668.78x = 10,076,315.56
5. Step 5: Solve for x
   x = 10,076,315.56/3,668.78
6. Step 6: Final answer
   x = 2,746.50