Finding the Fourth Proportional to 13,054.91, 18,015.78 and 7,086.57

Step by Step Solution

1. Step 1: Write the proportion equation
   13,054.91 : 18,015.78 = 7,086.57 : x
2. Step 2: Convert to fraction form
   13,054.91/18,015.78 = 7,086.57/x
3. Step 3: Cross multiply
   13,054.91x = 18,015.78 × 7,086.57
4. Step 4: Simplify right side
   13,054.91x = 127,670,086.07
5. Step 5: Solve for x
   x = 127,670,086.07/13,054.91
6. Step 6: Final answer
   x = 9,779.47