Finding the Fourth Proportional to 2,639.47, 3,642.10 and 1,520.01

Step by Step Solution

1. Step 1: Write the proportion equation
   2,639.47 : 3,642.10 = 1,520.01 : x
2. Step 2: Convert to fraction form
   2,639.47/3,642.10 = 1,520.01/x
3. Step 3: Cross multiply
   2,639.47x = 3,642.10 × 1,520.01
4. Step 4: Simplify right side
   2,639.47x = 5,536,028.42
5. Step 5: Solve for x
   x = 5,536,028.42/2,639.47
6. Step 6: Final answer
   x = 2,097.40