Finding the Fourth Proportional to 3,983.39, 5,978.16 and 2,136.05

Step by Step Solution

1. Step 1: Write the proportion equation
   3,983.39 : 5,978.16 = 2,136.05 : x
2. Step 2: Convert to fraction form
   3,983.39/5,978.16 = 2,136.05/x
3. Step 3: Cross multiply
   3,983.39x = 5,978.16 × 2,136.05
4. Step 4: Simplify right side
   3,983.39x = 12,769,663.61
5. Step 5: Solve for x
   x = 12,769,663.61/3,983.39
6. Step 6: Final answer
   x = 3,205.73