Finding the Fourth Proportional to 2,638.17, 3,953.46 and 1,155.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,638.17 : 3,953.46 = 1,155.60 : x
2. Step 2: Convert to fraction form
   2,638.17/3,953.46 = 1,155.60/x
3. Step 3: Cross multiply
   2,638.17x = 3,953.46 × 1,155.60
4. Step 4: Simplify right side
   2,638.17x = 4,568,618.38
5. Step 5: Solve for x
   x = 4,568,618.38/2,638.17
6. Step 6: Final answer
   x = 1,731.74