Finding the Fourth Proportional to 2,155.69, 2,974.35 and 1,271.17

Step by Step Solution

1. Step 1: Write the proportion equation
   2,155.69 : 2,974.35 = 1,271.17 : x
2. Step 2: Convert to fraction form
   2,155.69/2,974.35 = 1,271.17/x
3. Step 3: Cross multiply
   2,155.69x = 2,974.35 × 1,271.17
4. Step 4: Simplify right side
   2,155.69x = 3,780,904.49
5. Step 5: Solve for x
   x = 3,780,904.49/2,155.69
6. Step 6: Final answer
   x = 1,753.92