Finding the Fourth Proportional to 3,978.84, 5,491.78 and 2,301.22

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.84 : 5,491.78 = 2,301.22 : x
2. Step 2: Convert to fraction form
   3,978.84/5,491.78 = 2,301.22/x
3. Step 3: Cross multiply
   3,978.84x = 5,491.78 × 2,301.22
4. Step 4: Simplify right side
   3,978.84x = 12,637,793.97
5. Step 5: Solve for x
   x = 12,637,793.97/3,978.84
6. Step 6: Final answer
   x = 3,176.25