Finding the Fourth Proportional to 10,113.20, 13,956.48 and 5,636.72

Step by Step Solution

1. Step 1: Write the proportion equation
   10,113.20 : 13,956.48 = 5,636.72 : x
2. Step 2: Convert to fraction form
   10,113.20/13,956.48 = 5,636.72/x
3. Step 3: Cross multiply
   10,113.20x = 13,956.48 × 5,636.72
4. Step 4: Simplify right side
   10,113.20x = 78,668,769.95
5. Step 5: Solve for x
   x = 78,668,769.95/10,113.20
6. Step 6: Final answer
   x = 7,778.82