Finding the Fourth Proportional to 12,399.75, 17,106.78 and 7,091.73

Step by Step Solution

1. Step 1: Write the proportion equation
   12,399.75 : 17,106.78 = 7,091.73 : x
2. Step 2: Convert to fraction form
   12,399.75/17,106.78 = 7,091.73/x
3. Step 3: Cross multiply
   12,399.75x = 17,106.78 × 7,091.73
4. Step 4: Simplify right side
   12,399.75x = 121,316,664.93
5. Step 5: Solve for x
   x = 121,316,664.93/12,399.75
6. Step 6: Final answer
   x = 9,783.80