Finding the Fourth Proportional to 5,148.69, 7,105.16 and 2,790.78

Step by Step Solution

1. Step 1: Write the proportion equation
   5,148.69 : 7,105.16 = 2,790.78 : x
2. Step 2: Convert to fraction form
   5,148.69/7,105.16 = 2,790.78/x
3. Step 3: Cross multiply
   5,148.69x = 7,105.16 × 2,790.78
4. Step 4: Simplify right side
   5,148.69x = 19,828,924.47
5. Step 5: Solve for x
   x = 19,828,924.47/5,148.69
6. Step 6: Final answer
   x = 3,851.26