Finding the Fourth Proportional to 5,139.16, 7,092.06 and 2,781.30

Step by Step Solution

1. Step 1: Write the proportion equation
   5,139.16 : 7,092.06 = 2,781.30 : x
2. Step 2: Convert to fraction form
   5,139.16/7,092.06 = 2,781.30/x
3. Step 3: Cross multiply
   5,139.16x = 7,092.06 × 2,781.30
4. Step 4: Simplify right side
   5,139.16x = 19,725,132.72
5. Step 5: Solve for x
   x = 19,725,132.72/5,139.16
6. Step 6: Final answer
   x = 3,838.20