Finding the Fourth Proportional to 3,991.16, 5,978.82 and 3,170.84

Step by Step Solution

1. Step 1: Write the proportion equation
   3,991.16 : 5,978.82 = 3,170.84 : x
2. Step 2: Convert to fraction form
   3,991.16/5,978.82 = 3,170.84/x
3. Step 3: Cross multiply
   3,991.16x = 5,978.82 × 3,170.84
4. Step 4: Simplify right side
   3,991.16x = 18,957,881.61
5. Step 5: Solve for x
   x = 18,957,881.61/3,991.16
6. Step 6: Final answer
   x = 4,749.97