Finding the Fourth Proportional to 19,638.57, 27,101.60 and 10,686.15

Step by Step Solution

1. Step 1: Write the proportion equation
   19,638.57 : 27,101.60 = 10,686.15 : x
2. Step 2: Convert to fraction form
   19,638.57/27,101.60 = 10,686.15/x
3. Step 3: Cross multiply
   19,638.57x = 27,101.60 × 10,686.15
4. Step 4: Simplify right side
   19,638.57x = 289,611,709.41
5. Step 5: Solve for x
   x = 289,611,709.41/19,638.57
6. Step 6: Final answer
   x = 14,747.09