Finding the Fourth Proportional to 10,128.24, 15,179.40 and 5,196.96

Step by Step Solution

1. Step 1: Write the proportion equation
   10,128.24 : 15,179.40 = 5,196.96 : x
2. Step 2: Convert to fraction form
   10,128.24/15,179.40 = 5,196.96/x
3. Step 3: Cross multiply
   10,128.24x = 15,179.40 × 5,196.96
4. Step 4: Simplify right side
   10,128.24x = 78,886,734.62
5. Step 5: Solve for x
   x = 78,886,734.62/10,128.24
6. Step 6: Final answer
   x = 7,788.79