Finding the Fourth Proportional to 10,115.28, 13,957.72 and 5,638.82

Step by Step Solution

1. Step 1: Write the proportion equation
   10,115.28 : 13,957.72 = 5,638.82 : x
2. Step 2: Convert to fraction form
   10,115.28/13,957.72 = 5,638.82/x
3. Step 3: Cross multiply
   10,115.28x = 13,957.72 × 5,638.82
4. Step 4: Simplify right side
   10,115.28x = 78,704,986.80
5. Step 5: Solve for x
   x = 78,704,986.80/10,115.28
6. Step 6: Final answer
   x = 7,780.80