Finding the Fourth Proportional to 2,145.86, 3,212.94 and 1,624.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,145.86 : 3,212.94 = 1,624.28 : x
2. Step 2: Convert to fraction form
   2,145.86/3,212.94 = 1,624.28/x
3. Step 3: Cross multiply
   2,145.86x = 3,212.94 × 1,624.28
4. Step 4: Simplify right side
   2,145.86x = 5,218,722.22
5. Step 5: Solve for x
   x = 5,218,722.22/2,145.86
6. Step 6: Final answer
   x = 2,431.99