Finding the Fourth Proportional to 2,472.99, 3,709.83 and 912.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,472.99 : 3,709.83 = 912.80 : x
2. Step 2: Convert to fraction form
   2,472.99/3,709.83 = 912.80/x
3. Step 3: Cross multiply
   2,472.99x = 3,709.83 × 912.80
4. Step 4: Simplify right side
   2,472.99x = 3,386,314.27
5. Step 5: Solve for x
   x = 3,386,314.27/2,472.99
6. Step 6: Final answer
   x = 1,369.32