Finding the Fourth Proportional to 9,879.82, 13,647.46 and 7,904.50

Step by Step Solution

1. Step 1: Write the proportion equation
   9,879.82 : 13,647.46 = 7,904.50 : x
2. Step 2: Convert to fraction form
   9,879.82/13,647.46 = 7,904.50/x
3. Step 3: Cross multiply
   9,879.82x = 13,647.46 × 7,904.50
4. Step 4: Simplify right side
   9,879.82x = 107,876,279.33
5. Step 5: Solve for x
   x = 107,876,279.33/9,879.82
6. Step 6: Final answer
   x = 10,918.86