Finding the Fourth Proportional to 12,957.50, 19,439.49 and 5,558.30

Step by Step Solution

1. Step 1: Write the proportion equation
   12,957.50 : 19,439.49 = 5,558.30 : x
2. Step 2: Convert to fraction form
   12,957.50/19,439.49 = 5,558.30/x
3. Step 3: Cross multiply
   12,957.50x = 19,439.49 × 5,558.30
4. Step 4: Simplify right side
   12,957.50x = 108,050,517.27
5. Step 5: Solve for x
   x = 108,050,517.27/12,957.50
6. Step 6: Final answer
   x = 8,338.84