Finding the Fourth Proportional to 5,705.78, 7,873.89 and 3,187.93

Step by Step Solution

1. Step 1: Write the proportion equation
   5,705.78 : 7,873.89 = 3,187.93 : x
2. Step 2: Convert to fraction form
   5,705.78/7,873.89 = 3,187.93/x
3. Step 3: Cross multiply
   5,705.78x = 7,873.89 × 3,187.93
4. Step 4: Simplify right side
   5,705.78x = 25,101,410.15
5. Step 5: Solve for x
   x = 25,101,410.15/5,705.78
6. Step 6: Final answer
   x = 4,399.30