Finding the Fourth Proportional to 13,086.56, 18,063.28 and 7,785.12

Step by Step Solution

1. Step 1: Write the proportion equation
   13,086.56 : 18,063.28 = 7,785.12 : x
2. Step 2: Convert to fraction form
   13,086.56/18,063.28 = 7,785.12/x
3. Step 3: Cross multiply
   13,086.56x = 18,063.28 × 7,785.12
4. Step 4: Simplify right side
   13,086.56x = 140,624,802.39
5. Step 5: Solve for x
   x = 140,624,802.39/13,086.56
6. Step 6: Final answer
   x = 10,745.74