Finding the Fourth Proportional to 11,761.10, 17,639.82 and 3,439.16

Step by Step Solution

1. Step 1: Write the proportion equation
   11,761.10 : 17,639.82 = 3,439.16 : x
2. Step 2: Convert to fraction form
   11,761.10/17,639.82 = 3,439.16/x
3. Step 3: Cross multiply
   11,761.10x = 17,639.82 × 3,439.16
4. Step 4: Simplify right side
   11,761.10x = 60,666,075.15
5. Step 5: Solve for x
   x = 60,666,075.15/11,761.10
6. Step 6: Final answer
   x = 5,158.20