Finding the Fourth Proportional to 3,978.09, 5,493.84 and 2,981.79

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.09 : 5,493.84 = 2,981.79 : x
2. Step 2: Convert to fraction form
   3,978.09/5,493.84 = 2,981.79/x
3. Step 3: Cross multiply
   3,978.09x = 5,493.84 × 2,981.79
4. Step 4: Simplify right side
   3,978.09x = 16,381,477.17
5. Step 5: Solve for x
   x = 16,381,477.17/3,978.09
6. Step 6: Final answer
   x = 4,117.93