Finding the Fourth Proportional to 13,745.07, 18,967.91 and 7,776.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,745.07 : 18,967.91 = 7,776.72 : x
2. Step 2: Convert to fraction form
   13,745.07/18,967.91 = 7,776.72/x
3. Step 3: Cross multiply
   13,745.07x = 18,967.91 × 7,776.72
4. Step 4: Simplify right side
   13,745.07x = 147,508,086.17
5. Step 5: Solve for x
   x = 147,508,086.17/13,745.07
6. Step 6: Final answer
   x = 10,731.71