Finding the Fourth Proportional to 13,180.98, 19,771.55 and 3,947.06

Step by Step Solution

1. Step 1: Write the proportion equation
   13,180.98 : 19,771.55 = 3,947.06 : x
2. Step 2: Convert to fraction form
   13,180.98/19,771.55 = 3,947.06/x
3. Step 3: Cross multiply
   13,180.98x = 19,771.55 × 3,947.06
4. Step 4: Simplify right side
   13,180.98x = 78,039,494.14
5. Step 5: Solve for x
   x = 78,039,494.14/13,180.98
6. Step 6: Final answer
   x = 5,920.61