Finding the Fourth Proportional to 2,155.70, 3,231.72 and 1,277.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,155.70 : 3,231.72 = 1,277.25 : x
2. Step 2: Convert to fraction form
   2,155.70/3,231.72 = 1,277.25/x
3. Step 3: Cross multiply
   2,155.70x = 3,231.72 × 1,277.25
4. Step 4: Simplify right side
   2,155.70x = 4,127,714.37
5. Step 5: Solve for x
   x = 4,127,714.37/2,155.70
6. Step 6: Final answer
   x = 1,914.80