Finding the Fourth Proportional to 9,499.79, 13,109.91 and 5,521.25

Step by Step Solution

1. Step 1: Write the proportion equation
   9,499.79 : 13,109.91 = 5,521.25 : x
2. Step 2: Convert to fraction form
   9,499.79/13,109.91 = 5,521.25/x
3. Step 3: Cross multiply
   9,499.79x = 13,109.91 × 5,521.25
4. Step 4: Simplify right side
   9,499.79x = 72,383,090.59
5. Step 5: Solve for x
   x = 72,383,090.59/9,499.79
6. Step 6: Final answer
   x = 7,619.44