Finding the Fourth Proportional to 11,372.16, 17,028.72 and 9,739.20

Step by Step Solution

1. Step 1: Write the proportion equation
   11,372.16 : 17,028.72 = 9,739.20 : x
2. Step 2: Convert to fraction form
   11,372.16/17,028.72 = 9,739.20/x
3. Step 3: Cross multiply
   11,372.16x = 17,028.72 × 9,739.20
4. Step 4: Simplify right side
   11,372.16x = 165,846,109.82
5. Step 5: Solve for x
   x = 165,846,109.82/11,372.16
6. Step 6: Final answer
   x = 14,583.52