Finding the Fourth Proportional to 7,139.48, 10,704.60 and 3,854.90

Step by Step Solution

1. Step 1: Write the proportion equation
   7,139.48 : 10,704.60 = 3,854.90 : x
2. Step 2: Convert to fraction form
   7,139.48/10,704.60 = 3,854.90/x
3. Step 3: Cross multiply
   7,139.48x = 10,704.60 × 3,854.90
4. Step 4: Simplify right side
   7,139.48x = 41,265,162.54
5. Step 5: Solve for x
   x = 41,265,162.54/7,139.48
6. Step 6: Final answer
   x = 5,779.86