Finding the Fourth Proportional to 10,578.21, 15,868.37 and 3,916.49

Step by Step Solution

1. Step 1: Write the proportion equation
   10,578.21 : 15,868.37 = 3,916.49 : x
2. Step 2: Convert to fraction form
   10,578.21/15,868.37 = 3,916.49/x
3. Step 3: Cross multiply
   10,578.21x = 15,868.37 × 3,916.49
4. Step 4: Simplify right side
   10,578.21x = 62,148,213.50
5. Step 5: Solve for x
   x = 62,148,213.50/10,578.21
6. Step 6: Final answer
   x = 5,875.12