Finding the Fourth Proportional to 2,145.68, 3,221.40 and 1,759.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,145.68 : 3,221.40 = 1,759.76 : x
2. Step 2: Convert to fraction form
   2,145.68/3,221.40 = 1,759.76/x
3. Step 3: Cross multiply
   2,145.68x = 3,221.40 × 1,759.76
4. Step 4: Simplify right side
   2,145.68x = 5,668,890.86
5. Step 5: Solve for x
   x = 5,668,890.86/2,145.68
6. Step 6: Final answer
   x = 2,642.00