Finding the Fourth Proportional to 13,091.85, 18,072.59 and 7,788.51

Step by Step Solution

1. Step 1: Write the proportion equation
   13,091.85 : 18,072.59 = 7,788.51 : x
2. Step 2: Convert to fraction form
   13,091.85/18,072.59 = 7,788.51/x
3. Step 3: Cross multiply
   13,091.85x = 18,072.59 × 7,788.51
4. Step 4: Simplify right side
   13,091.85x = 140,758,509.00
5. Step 5: Solve for x
   x = 140,758,509.00/13,091.85
6. Step 6: Final answer
   x = 10,751.61