Finding the Fourth Proportional to 5,131.80, 7,081.86 and 2,773.92

Step by Step Solution

1. Step 1: Write the proportion equation
   5,131.80 : 7,081.86 = 2,773.92 : x
2. Step 2: Convert to fraction form
   5,131.80/7,081.86 = 2,773.92/x
3. Step 3: Cross multiply
   5,131.80x = 7,081.86 × 2,773.92
4. Step 4: Simplify right side
   5,131.80x = 19,644,513.09
5. Step 5: Solve for x
   x = 19,644,513.09/5,131.80
6. Step 6: Final answer
   x = 3,828.00