Finding the Fourth Proportional to 13,111.40, 18,099 and 7,805.18

Step by Step Solution

1. Step 1: Write the proportion equation
   13,111.40 : 18,099 = 7,805.18 : x
2. Step 2: Convert to fraction form
   13,111.40/18,099 = 7,805.18/x
3. Step 3: Cross multiply
   13,111.40x = 18,099 × 7,805.18
4. Step 4: Simplify right side
   13,111.40x = 141,265,952.82
5. Step 5: Solve for x
   x = 141,265,952.82/13,111.40
6. Step 6: Final answer
   x = 10,774.28