Finding the Fourth Proportional to 2,978.84, 4,105.14 and 2,905.94

Step by Step Solution

1. Step 1: Write the proportion equation
   2,978.84 : 4,105.14 = 2,905.94 : x
2. Step 2: Convert to fraction form
   2,978.84/4,105.14 = 2,905.94/x
3. Step 3: Cross multiply
   2,978.84x = 4,105.14 × 2,905.94
4. Step 4: Simplify right side
   2,978.84x = 11,929,290.53
5. Step 5: Solve for x
   x = 11,929,290.53/2,978.84
6. Step 6: Final answer
   x = 4,004.68