Finding the Fourth Proportional to 2,315.86, 3,195.25 and 1,320.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,315.86 : 3,195.25 = 1,320.78 : x
2. Step 2: Convert to fraction form
   2,315.86/3,195.25 = 1,320.78/x
3. Step 3: Cross multiply
   2,315.86x = 3,195.25 × 1,320.78
4. Step 4: Simplify right side
   2,315.86x = 4,220,222.30
5. Step 5: Solve for x
   x = 4,220,222.30/2,315.86
6. Step 6: Final answer
   x = 1,822.31