Finding the Fourth Proportional to 13,055.09, 18,016.05 and 7,086.78

Step by Step Solution

1. Step 1: Write the proportion equation
   13,055.09 : 18,016.05 = 7,086.78 : x
2. Step 2: Convert to fraction form
   13,055.09/18,016.05 = 7,086.78/x
3. Step 3: Cross multiply
   13,055.09x = 18,016.05 × 7,086.78
4. Step 4: Simplify right side
   13,055.09x = 127,675,809.39
5. Step 5: Solve for x
   x = 127,675,809.39/13,055.09
6. Step 6: Final answer
   x = 9,779.78