Finding the Fourth Proportional to 2,639.84, 3,642.85 and 1,520.81

Step by Step Solution

1. Step 1: Write the proportion equation
   2,639.84 : 3,642.85 = 1,520.81 : x
2. Step 2: Convert to fraction form
   2,639.84/3,642.85 = 1,520.81/x
3. Step 3: Cross multiply
   2,639.84x = 3,642.85 × 1,520.81
4. Step 4: Simplify right side
   2,639.84x = 5,540,082.71
5. Step 5: Solve for x
   x = 5,540,082.71/2,639.84
6. Step 6: Final answer
   x = 2,098.64