Finding the Fourth Proportional to 2,639.30, 3,642.32 and 1,520.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,639.30 : 3,642.32 = 1,520.15 : x
2. Step 2: Convert to fraction form
   2,639.30/3,642.32 = 1,520.15/x
3. Step 3: Cross multiply
   2,639.30x = 3,642.32 × 1,520.15
4. Step 4: Simplify right side
   2,639.30x = 5,536,846.94
5. Step 5: Solve for x
   x = 5,536,846.94/2,639.30
6. Step 6: Final answer
   x = 2,097.85