Finding the Fourth Proportional to 13,111.81, 18,085.28 and 8,393.96

Step by Step Solution

1. Step 1: Write the proportion equation
   13,111.81 : 18,085.28 = 8,393.96 : x
2. Step 2: Convert to fraction form
   13,111.81/18,085.28 = 8,393.96/x
3. Step 3: Cross multiply
   13,111.81x = 18,085.28 × 8,393.96
4. Step 4: Simplify right side
   13,111.81x = 151,807,120.15
5. Step 5: Solve for x
   x = 151,807,120.15/13,111.81
6. Step 6: Final answer
   x = 11,577.89