Finding the Fourth Proportional to 9,009.91, 13,455.72 and 7,679.49

Step by Step Solution

1. Step 1: Write the proportion equation
   9,009.91 : 13,455.72 = 7,679.49 : x
2. Step 2: Convert to fraction form
   9,009.91/13,455.72 = 7,679.49/x
3. Step 3: Cross multiply
   9,009.91x = 13,455.72 × 7,679.49
4. Step 4: Simplify right side
   9,009.91x = 103,333,067.18
5. Step 5: Solve for x
   x = 103,333,067.18/9,009.91
6. Step 6: Final answer
   x = 11,468.82