Finding the Fourth Proportional to 7,045.21, 10,578.17 and 3,931.30

Step by Step Solution

1. Step 1: Write the proportion equation
   7,045.21 : 10,578.17 = 3,931.30 : x
2. Step 2: Convert to fraction form
   7,045.21/10,578.17 = 3,931.30/x
3. Step 3: Cross multiply
   7,045.21x = 10,578.17 × 3,931.30
4. Step 4: Simplify right side
   7,045.21x = 41,585,959.72
5. Step 5: Solve for x
   x = 41,585,959.72/7,045.21
6. Step 6: Final answer
   x = 5,902.73