Finding the Fourth Proportional to 11,322.88, 15,623.76 and 7,128.16

Step by Step Solution

1. Step 1: Write the proportion equation
   11,322.88 : 15,623.76 = 7,128.16 : x
2. Step 2: Convert to fraction form
   11,322.88/15,623.76 = 7,128.16/x
3. Step 3: Cross multiply
   11,322.88x = 15,623.76 × 7,128.16
4. Step 4: Simplify right side
   11,322.88x = 111,368,661.08
5. Step 5: Solve for x
   x = 111,368,661.08/11,322.88
6. Step 6: Final answer
   x = 9,835.72