Finding the Fourth Proportional to 13,185.90, 18,188.82 and 7,806.48

Step by Step Solution

1. Step 1: Write the proportion equation
   13,185.90 : 18,188.82 = 7,806.48 : x
2. Step 2: Convert to fraction form
   13,185.90/18,188.82 = 7,806.48/x
3. Step 3: Cross multiply
   13,185.90x = 18,188.82 × 7,806.48
4. Step 4: Simplify right side
   13,185.90x = 141,990,659.55
5. Step 5: Solve for x
   x = 141,990,659.55/13,185.90
6. Step 6: Final answer
   x = 10,768.37