Finding the Fourth Proportional to 10,115.56, 13,958.94 and 5,578.98

Step by Step Solution

1. Step 1: Write the proportion equation
   10,115.56 : 13,958.94 = 5,578.98 : x
2. Step 2: Convert to fraction form
   10,115.56/13,958.94 = 5,578.98/x
3. Step 3: Cross multiply
   10,115.56x = 13,958.94 × 5,578.98
4. Step 4: Simplify right side
   10,115.56x = 77,876,695.93
5. Step 5: Solve for x
   x = 77,876,695.93/10,115.56
6. Step 6: Final answer
   x = 7,698.71