Finding the Fourth Proportional to 13,758.86, 18,986.86 and 7,791.10

Step by Step Solution

1. Step 1: Write the proportion equation
   13,758.86 : 18,986.86 = 7,791.10 : x
2. Step 2: Convert to fraction form
   13,758.86/18,986.86 = 7,791.10/x
3. Step 3: Cross multiply
   13,758.86x = 18,986.86 × 7,791.10
4. Step 4: Simplify right side
   13,758.86x = 147,928,391.06
5. Step 5: Solve for x
   x = 147,928,391.06/13,758.86
6. Step 6: Final answer
   x = 10,751.50