Finding the Fourth Proportional to 13,015.82, 19,517.85 and 4,128.59

Step by Step Solution

1. Step 1: Write the proportion equation
   13,015.82 : 19,517.85 = 4,128.59 : x
2. Step 2: Convert to fraction form
   13,015.82/19,517.85 = 4,128.59/x
3. Step 3: Cross multiply
   13,015.82x = 19,517.85 × 4,128.59
4. Step 4: Simplify right side
   13,015.82x = 80,581,249.13
5. Step 5: Solve for x
   x = 80,581,249.13/13,015.82
6. Step 6: Final answer
   x = 6,191.02