Finding the Fourth Proportional to 5,087.78, 7,021.82 and 3,071.30

Step by Step Solution

1. Step 1: Write the proportion equation
   5,087.78 : 7,021.82 = 3,071.30 : x
2. Step 2: Convert to fraction form
   5,087.78/7,021.82 = 3,071.30/x
3. Step 3: Cross multiply
   5,087.78x = 7,021.82 × 3,071.30
4. Step 4: Simplify right side
   5,087.78x = 21,566,065.30
5. Step 5: Solve for x
   x = 21,566,065.30/5,087.78
6. Step 6: Final answer
   x = 4,238.80