Finding the Fourth Proportional to 5,139.05, 7,091.89 and 2,781.18

Step by Step Solution

1. Step 1: Write the proportion equation
   5,139.05 : 7,091.89 = 2,781.18 : x
2. Step 2: Convert to fraction form
   5,139.05/7,091.89 = 2,781.18/x
3. Step 3: Cross multiply
   5,139.05x = 7,091.89 × 2,781.18
4. Step 4: Simplify right side
   5,139.05x = 19,723,815.68
5. Step 5: Solve for x
   x = 19,723,815.68/5,139.05
6. Step 6: Final answer
   x = 3,838.03