Finding the Fourth Proportional to 12,405.20, 17,119.56 and 7,101.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,405.20 : 17,119.56 = 7,101.72 : x
2. Step 2: Convert to fraction form
   12,405.20/17,119.56 = 7,101.72/x
3. Step 3: Cross multiply
   12,405.20x = 17,119.56 × 7,101.72
4. Step 4: Simplify right side
   12,405.20x = 121,578,321.64
5. Step 5: Solve for x
   x = 121,578,321.64/12,405.20
6. Step 6: Final answer
   x = 9,800.60