Finding the Fourth Proportional to 1,978.44, 2,964.78 and 1,431.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,978.44 : 2,964.78 = 1,431.78 : x
2. Step 2: Convert to fraction form
   1,978.44/2,964.78 = 1,431.78/x
3. Step 3: Cross multiply
   1,978.44x = 2,964.78 × 1,431.78
4. Step 4: Simplify right side
   1,978.44x = 4,244,912.71
5. Step 5: Solve for x
   x = 4,244,912.71/1,978.44
6. Step 6: Final answer
   x = 2,145.59