Finding the Fourth Proportional to 2,453.16, 3,384.50 and 1,390.77

Step by Step Solution

1. Step 1: Write the proportion equation
   2,453.16 : 3,384.50 = 1,390.77 : x
2. Step 2: Convert to fraction form
   2,453.16/3,384.50 = 1,390.77/x
3. Step 3: Cross multiply
   2,453.16x = 3,384.50 × 1,390.77
4. Step 4: Simplify right side
   2,453.16x = 4,707,037.19
5. Step 5: Solve for x
   x = 4,707,037.19/2,453.16
6. Step 6: Final answer
   x = 1,918.77