Finding the Fourth Proportional to 2,156.10, 2,975.81 and 1,271.85

Step by Step Solution

1. Step 1: Write the proportion equation
   2,156.10 : 2,975.81 = 1,271.85 : x
2. Step 2: Convert to fraction form
   2,156.10/2,975.81 = 1,271.85/x
3. Step 3: Cross multiply
   2,156.10x = 2,975.81 × 1,271.85
4. Step 4: Simplify right side
   2,156.10x = 3,784,777.59
5. Step 5: Solve for x
   x = 3,784,777.59/2,156.10
6. Step 6: Final answer
   x = 1,755.38