Finding the Fourth Proportional to 13,091.40, 18,068.72 and 7,785.18

Step by Step Solution

1. Step 1: Write the proportion equation
   13,091.40 : 18,068.72 = 7,785.18 : x
2. Step 2: Convert to fraction form
   13,091.40/18,068.72 = 7,785.18/x
3. Step 3: Cross multiply
   13,091.40x = 18,068.72 × 7,785.18
4. Step 4: Simplify right side
   13,091.40x = 140,668,198.64
5. Step 5: Solve for x
   x = 140,668,198.64/13,091.40
6. Step 6: Final answer
   x = 10,745.08