Finding the Fourth Proportional to 5,185.78, 7,156.34 and 2,828.02

Step by Step Solution

1. Step 1: Write the proportion equation
   5,185.78 : 7,156.34 = 2,828.02 : x
2. Step 2: Convert to fraction form
   5,185.78/7,156.34 = 2,828.02/x
3. Step 3: Cross multiply
   5,185.78x = 7,156.34 × 2,828.02
4. Step 4: Simplify right side
   5,185.78x = 20,238,272.65
5. Step 5: Solve for x
   x = 20,238,272.65/5,185.78
6. Step 6: Final answer
   x = 3,902.65