Finding the Fourth Proportional to 3,990.16, 5,983.92 and 1,681.12

Step by Step Solution

1. Step 1: Write the proportion equation
   3,990.16 : 5,983.92 = 1,681.12 : x
2. Step 2: Convert to fraction form
   3,990.16/5,983.92 = 1,681.12/x
3. Step 3: Cross multiply
   3,990.16x = 5,983.92 × 1,681.12
4. Step 4: Simplify right side
   3,990.16x = 10,059,687.59
5. Step 5: Solve for x
   x = 10,059,687.59/3,990.16
6. Step 6: Final answer
   x = 2,521.12