Finding the Fourth Proportional to 11,958.76, 17,938.82 and 3,639.05

Step by Step Solution

1. Step 1: Write the proportion equation
   11,958.76 : 17,938.82 = 3,639.05 : x
2. Step 2: Convert to fraction form
   11,958.76/17,938.82 = 3,639.05/x
3. Step 3: Cross multiply
   11,958.76x = 17,938.82 × 3,639.05
4. Step 4: Simplify right side
   11,958.76x = 65,280,262.92
5. Step 5: Solve for x
   x = 65,280,262.92/11,958.76
6. Step 6: Final answer
   x = 5,458.78