Finding the Fourth Proportional to 13,647.48, 20,451.98 and 10,861.76

Step by Step Solution

1. Step 1: Write the proportion equation
   13,647.48 : 20,451.98 = 10,861.76 : x
2. Step 2: Convert to fraction form
   13,647.48/20,451.98 = 10,861.76/x
3. Step 3: Cross multiply
   13,647.48x = 20,451.98 × 10,861.76
4. Step 4: Simplify right side
   13,647.48x = 222,144,498.28
5. Step 5: Solve for x
   x = 222,144,498.28/13,647.48
6. Step 6: Final answer
   x = 16,277.33