Finding the Fourth Proportional to 5,139.25, 7,092.18 and 2,781.38

Step by Step Solution

1. Step 1: Write the proportion equation
   5,139.25 : 7,092.18 = 2,781.38 : x
2. Step 2: Convert to fraction form
   5,139.25/7,092.18 = 2,781.38/x
3. Step 3: Cross multiply
   5,139.25x = 7,092.18 × 2,781.38
4. Step 4: Simplify right side
   5,139.25x = 19,726,065.34
5. Step 5: Solve for x
   x = 19,726,065.34/5,139.25
6. Step 6: Final answer
   x = 3,838.32