Finding the Fourth Proportional to 3,978.35, 5,938.41 and 3,689.22

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.35 : 5,938.41 = 3,689.22 : x
2. Step 2: Convert to fraction form
   3,978.35/5,938.41 = 3,689.22/x
3. Step 3: Cross multiply
   3,978.35x = 5,938.41 × 3,689.22
4. Step 4: Simplify right side
   3,978.35x = 21,908,100.94
5. Step 5: Solve for x
   x = 21,908,100.94/3,978.35
6. Step 6: Final answer
   x = 5,506.83