Finding the Fourth Proportional to 1,948.31, 2,919.12 and 1,289.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,948.31 : 2,919.12 = 1,289.78 : x
2. Step 2: Convert to fraction form
   1,948.31/2,919.12 = 1,289.78/x
3. Step 3: Cross multiply
   1,948.31x = 2,919.12 × 1,289.78
4. Step 4: Simplify right side
   1,948.31x = 3,765,022.59
5. Step 5: Solve for x
   x = 3,765,022.59/1,948.31
6. Step 6: Final answer
   x = 1,932.46