Finding the Fourth Proportional to 12,855.89, 17,741.36 and 7,820.33

Step by Step Solution

1. Step 1: Write the proportion equation
   12,855.89 : 17,741.36 = 7,820.33 : x
2. Step 2: Convert to fraction form
   12,855.89/17,741.36 = 7,820.33/x
3. Step 3: Cross multiply
   12,855.89x = 17,741.36 × 7,820.33
4. Step 4: Simplify right side
   12,855.89x = 138,743,162.04
5. Step 5: Solve for x
   x = 138,743,162.04/12,855.89
6. Step 6: Final answer
   x = 10,792.19