Finding the Fourth Proportional to 2,145.29, 3,216.79 and 1,104.87

Step by Step Solution

1. Step 1: Write the proportion equation
   2,145.29 : 3,216.79 = 1,104.87 : x
2. Step 2: Convert to fraction form
   2,145.29/3,216.79 = 1,104.87/x
3. Step 3: Cross multiply
   2,145.29x = 3,216.79 × 1,104.87
4. Step 4: Simplify right side
   2,145.29x = 3,554,130.12
5. Step 5: Solve for x
   x = 3,554,130.12/2,145.29
6. Step 6: Final answer
   x = 1,656.71