Finding the Fourth Proportional to 2,639.69, 3,642.77 and 1,520.67

Step by Step Solution

1. Step 1: Write the proportion equation
   2,639.69 : 3,642.77 = 1,520.67 : x
2. Step 2: Convert to fraction form
   2,639.69/3,642.77 = 1,520.67/x
3. Step 3: Cross multiply
   2,639.69x = 3,642.77 × 1,520.67
4. Step 4: Simplify right side
   2,639.69x = 5,539,468.52
5. Step 5: Solve for x
   x = 5,539,468.52/2,639.69
6. Step 6: Final answer
   x = 2,098.53