Finding the Fourth Proportional to 9,104.69, 13,659.10 and 2,780.15

Step by Step Solution

1. Step 1: Write the proportion equation
   9,104.69 : 13,659.10 = 2,780.15 : x
2. Step 2: Convert to fraction form
   9,104.69/13,659.10 = 2,780.15/x
3. Step 3: Cross multiply
   9,104.69x = 13,659.10 × 2,780.15
4. Step 4: Simplify right side
   9,104.69x = 37,974,271.62
5. Step 5: Solve for x
   x = 37,974,271.62/9,104.69
6. Step 6: Final answer
   x = 4,170.85