Finding the Fourth Proportional to 2,311.37, 3,188.79 and 1,425.63

Step by Step Solution

1. Step 1: Write the proportion equation
   2,311.37 : 3,188.79 = 1,425.63 : x
2. Step 2: Convert to fraction form
   2,311.37/3,188.79 = 1,425.63/x
3. Step 3: Cross multiply
   2,311.37x = 3,188.79 × 1,425.63
4. Step 4: Simplify right side
   2,311.37x = 4,546,034.69
5. Step 5: Solve for x
   x = 4,546,034.69/2,311.37
6. Step 6: Final answer
   x = 1,966.82