Finding the Fourth Proportional to 2,143.25, 3,215.13 and 756.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,143.25 : 3,215.13 = 756.30 : x
2. Step 2: Convert to fraction form
   2,143.25/3,215.13 = 756.30/x
3. Step 3: Cross multiply
   2,143.25x = 3,215.13 × 756.30
4. Step 4: Simplify right side
   2,143.25x = 2,431,602.82
5. Step 5: Solve for x
   x = 2,431,602.82/2,143.25
6. Step 6: Final answer
   x = 1,134.54