Finding the Fourth Proportional to 1,298.44, 1,789.50 and 1,077.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,298.44 : 1,789.50 = 1,077.40 : x
2. Step 2: Convert to fraction form
   1,298.44/1,789.50 = 1,077.40/x
3. Step 3: Cross multiply
   1,298.44x = 1,789.50 × 1,077.40
4. Step 4: Simplify right side
   1,298.44x = 1,928,007.30
5. Step 5: Solve for x
   x = 1,928,007.30/1,298.44
6. Step 6: Final answer
   x = 1,484.86