Finding the Fourth Proportional to 2,315.31, 3,195.12 and 1,320.59

Step by Step Solution

1. Step 1: Write the proportion equation
   2,315.31 : 3,195.12 = 1,320.59 : x
2. Step 2: Convert to fraction form
   2,315.31/3,195.12 = 1,320.59/x
3. Step 3: Cross multiply
   2,315.31x = 3,195.12 × 1,320.59
4. Step 4: Simplify right side
   2,315.31x = 4,219,443.52
5. Step 5: Solve for x
   x = 4,219,443.52/2,315.31
6. Step 6: Final answer
   x = 1,822.41