Finding the Fourth Proportional to 2,145.93, 3,216.59 and 1,405.26

Step by Step Solution

1. Step 1: Write the proportion equation
   2,145.93 : 3,216.59 = 1,405.26 : x
2. Step 2: Convert to fraction form
   2,145.93/3,216.59 = 1,405.26/x
3. Step 3: Cross multiply
   2,145.93x = 3,216.59 × 1,405.26
4. Step 4: Simplify right side
   2,145.93x = 4,520,145.26
5. Step 5: Solve for x
   x = 4,520,145.26/2,145.93
6. Step 6: Final answer
   x = 2,106.38