Finding the Fourth Proportional to 3,990.04, 5,983.98 and 1,681

Step by Step Solution

1. Step 1: Write the proportion equation
   3,990.04 : 5,983.98 = 1,681 : x
2. Step 2: Convert to fraction form
   3,990.04/5,983.98 = 1,681/x
3. Step 3: Cross multiply
   3,990.04x = 5,983.98 × 1,681
4. Step 4: Simplify right side
   3,990.04x = 10,059,070.38
5. Step 5: Solve for x
   x = 10,059,070.38/3,990.04
6. Step 6: Final answer
   x = 2,521.04