Finding the Fourth Proportional to 2,868.90, 3,953.70 and 1,983.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,868.90 : 3,953.70 = 1,983.12 : x
2. Step 2: Convert to fraction form
   2,868.90/3,953.70 = 1,983.12/x
3. Step 3: Cross multiply
   2,868.90x = 3,953.70 × 1,983.12
4. Step 4: Simplify right side
   2,868.90x = 7,840,661.54
5. Step 5: Solve for x
   x = 7,840,661.54/2,868.90
6. Step 6: Final answer
   x = 2,732.99