Finding the Fourth Proportional to 3,978.97, 5,491.64 and 2,300.09

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.97 : 5,491.64 = 2,300.09 : x
2. Step 2: Convert to fraction form
   3,978.97/5,491.64 = 2,300.09/x
3. Step 3: Cross multiply
   3,978.97x = 5,491.64 × 2,300.09
4. Step 4: Simplify right side
   3,978.97x = 12,631,244.54
5. Step 5: Solve for x
   x = 12,631,244.54/3,978.97
6. Step 6: Final answer
   x = 3,174.50