Finding the Fourth Proportional to 2,315.34, 3,195.20 and 1,320.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,315.34 : 3,195.20 = 1,320.72 : x
2. Step 2: Convert to fraction form
   2,315.34/3,195.20 = 1,320.72/x
3. Step 3: Cross multiply
   2,315.34x = 3,195.20 × 1,320.72
4. Step 4: Simplify right side
   2,315.34x = 4,219,955.86
5. Step 5: Solve for x
   x = 4,219,955.86/2,315.34
6. Step 6: Final answer
   x = 1,822.61