Finding the Fourth Proportional to 11,915.86, 17,793.56 and 9,728.86

Step by Step Solution

1. Step 1: Write the proportion equation
   11,915.86 : 17,793.56 = 9,728.86 : x
2. Step 2: Convert to fraction form
   11,915.86/17,793.56 = 9,728.86/x
3. Step 3: Cross multiply
   11,915.86x = 17,793.56 × 9,728.86
4. Step 4: Simplify right side
   11,915.86x = 173,111,054.14
5. Step 5: Solve for x
   x = 173,111,054.14/11,915.86
6. Step 6: Final answer
   x = 14,527.79