Finding the Fourth Proportional to 3,642.20, 5,025.45 and 2,315.42

Step by Step Solution

1. Step 1: Write the proportion equation
   3,642.20 : 5,025.45 = 2,315.42 : x
2. Step 2: Convert to fraction form
   3,642.20/5,025.45 = 2,315.42/x
3. Step 3: Cross multiply
   3,642.20x = 5,025.45 × 2,315.42
4. Step 4: Simplify right side
   3,642.20x = 11,636,002.31
5. Step 5: Solve for x
   x = 11,636,002.31/3,642.20
6. Step 6: Final answer
   x = 3,194.78