Finding the Fourth Proportional to 12,684.28, 19,019.58 and 3,916.84

Step by Step Solution

1. Step 1: Write the proportion equation
   12,684.28 : 19,019.58 = 3,916.84 : x
2. Step 2: Convert to fraction form
   12,684.28/19,019.58 = 3,916.84/x
3. Step 3: Cross multiply
   12,684.28x = 19,019.58 × 3,916.84
4. Step 4: Simplify right side
   12,684.28x = 74,496,651.73
5. Step 5: Solve for x
   x = 74,496,651.73/12,684.28
6. Step 6: Final answer
   x = 5,873.15