Finding the Fourth Proportional to 2,640.07, 3,643.15 and 1,505.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,640.07 : 3,643.15 = 1,505.57 : x
2. Step 2: Convert to fraction form
   2,640.07/3,643.15 = 1,505.57/x
3. Step 3: Cross multiply
   2,640.07x = 3,643.15 × 1,505.57
4. Step 4: Simplify right side
   2,640.07x = 5,485,040.40
5. Step 5: Solve for x
   x = 5,485,040.40/2,640.07
6. Step 6: Final answer
   x = 2,077.61