Finding the Fourth Proportional to 5,431.05, 7,491.69 and 3,072.74

Step by Step Solution

1. Step 1: Write the proportion equation
   5,431.05 : 7,491.69 = 3,072.74 : x
2. Step 2: Convert to fraction form
   5,431.05/7,491.69 = 3,072.74/x
3. Step 3: Cross multiply
   5,431.05x = 7,491.69 × 3,072.74
4. Step 4: Simplify right side
   5,431.05x = 23,019,978.07
5. Step 5: Solve for x
   x = 23,019,978.07/5,431.05
6. Step 6: Final answer
   x = 4,238.59