Finding the Fourth Proportional to 11,365.73, 15,680.28 and 7,115.05

Step by Step Solution

1. Step 1: Write the proportion equation
   11,365.73 : 15,680.28 = 7,115.05 : x
2. Step 2: Convert to fraction form
   11,365.73/15,680.28 = 7,115.05/x
3. Step 3: Cross multiply
   11,365.73x = 15,680.28 × 7,115.05
4. Step 4: Simplify right side
   11,365.73x = 111,565,976.21
5. Step 5: Solve for x
   x = 111,565,976.21/11,365.73
6. Step 6: Final answer
   x = 9,816.00