Finding the Fourth Proportional to 12,357, 18,535.59 and 3,123

Step by Step Solution

1. Step 1: Write the proportion equation
   12,357 : 18,535.59 = 3,123 : x
2. Step 2: Convert to fraction form
   12,357/18,535.59 = 3,123/x
3. Step 3: Cross multiply
   12,357x = 18,535.59 × 3,123
4. Step 4: Simplify right side
   12,357x = 57,886,647.57
5. Step 5: Solve for x
   x = 57,886,647.57/12,357
6. Step 6: Final answer
   x = 4,684.52