Finding the Fourth Proportional to 2,158.06, 3,236.40 and 1,431.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,158.06 : 3,236.40 = 1,431.50 : x
2. Step 2: Convert to fraction form
   2,158.06/3,236.40 = 1,431.50/x
3. Step 3: Cross multiply
   2,158.06x = 3,236.40 × 1,431.50
4. Step 4: Simplify right side
   2,158.06x = 4,632,906.60
5. Step 5: Solve for x
   x = 4,632,906.60/2,158.06
6. Step 6: Final answer
   x = 2,146.79