Finding the Fourth Proportional to 9,621.20, 13,279.56 and 7,259.60

Step by Step Solution

1. Step 1: Write the proportion equation
   9,621.20 : 13,279.56 = 7,259.60 : x
2. Step 2: Convert to fraction form
   9,621.20/13,279.56 = 7,259.60/x
3. Step 3: Cross multiply
   9,621.20x = 13,279.56 × 7,259.60
4. Step 4: Simplify right side
   9,621.20x = 96,404,293.78
5. Step 5: Solve for x
   x = 96,404,293.78/9,621.20
6. Step 6: Final answer
   x = 10,019.99