Finding the Fourth Proportional to 13,647.78, 18,832.41 and 7,681.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,647.78 : 18,832.41 = 7,681.50 : x
2. Step 2: Convert to fraction form
   13,647.78/18,832.41 = 7,681.50/x
3. Step 3: Cross multiply
   13,647.78x = 18,832.41 × 7,681.50
4. Step 4: Simplify right side
   13,647.78x = 144,661,157.42
5. Step 5: Solve for x
   x = 144,661,157.42/13,647.78
6. Step 6: Final answer
   x = 10,599.61