Finding the Fourth Proportional to 12,916.87, 19,375.78 and 3,557.61

Step by Step Solution

1. Step 1: Write the proportion equation
   12,916.87 : 19,375.78 = 3,557.61 : x
2. Step 2: Convert to fraction form
   12,916.87/19,375.78 = 3,557.61/x
3. Step 3: Cross multiply
   12,916.87x = 19,375.78 × 3,557.61
4. Step 4: Simplify right side
   12,916.87x = 68,931,468.69
5. Step 5: Solve for x
   x = 68,931,468.69/12,916.87
6. Step 6: Final answer
   x = 5,336.55