Finding the Fourth Proportional to 12,923.76, 19,389 and 3,690.48

Step by Step Solution

1. Step 1: Write the proportion equation
   12,923.76 : 19,389 = 3,690.48 : x
2. Step 2: Convert to fraction form
   12,923.76/19,389 = 3,690.48/x
3. Step 3: Cross multiply
   12,923.76x = 19,389 × 3,690.48
4. Step 4: Simplify right side
   12,923.76x = 71,554,716.72
5. Step 5: Solve for x
   x = 71,554,716.72/12,923.76
6. Step 6: Final answer
   x = 5,536.68