Finding the Fourth Proportional to 13,127.82, 18,103.83 and 9,978.54

Step by Step Solution

1. Step 1: Write the proportion equation
   13,127.82 : 18,103.83 = 9,978.54 : x
2. Step 2: Convert to fraction form
   13,127.82/18,103.83 = 9,978.54/x
3. Step 3: Cross multiply
   13,127.82x = 18,103.83 × 9,978.54
4. Step 4: Simplify right side
   13,127.82x = 180,649,791.81
5. Step 5: Solve for x
   x = 180,649,791.81/13,127.82
6. Step 6: Final answer
   x = 13,760.84