Finding the Fourth Proportional to 19,591.20, 27,035.88 and 10,638.72

Step by Step Solution

1. Step 1: Write the proportion equation
   19,591.20 : 27,035.88 = 10,638.72 : x
2. Step 2: Convert to fraction form
   19,591.20/27,035.88 = 10,638.72/x
3. Step 3: Cross multiply
   19,591.20x = 27,035.88 × 10,638.72
4. Step 4: Simplify right side
   19,591.20x = 287,627,157.27
5. Step 5: Solve for x
   x = 287,627,157.27/19,591.20
6. Step 6: Final answer
   x = 14,681.45