Finding the Fourth Proportional to 2,639.02, 3,641.90 and 1,577.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,639.02 : 3,641.90 = 1,577.28 : x
2. Step 2: Convert to fraction form
   2,639.02/3,641.90 = 1,577.28/x
3. Step 3: Cross multiply
   2,639.02x = 3,641.90 × 1,577.28
4. Step 4: Simplify right side
   2,639.02x = 5,744,296.03
5. Step 5: Solve for x
   x = 5,744,296.03/2,639.02
6. Step 6: Final answer
   x = 2,176.68