Finding the Fourth Proportional to 2,758.78, 4,139.52 and 1,298.08

Step by Step Solution

1. Step 1: Write the proportion equation
   2,758.78 : 4,139.52 = 1,298.08 : x
2. Step 2: Convert to fraction form
   2,758.78/4,139.52 = 1,298.08/x
3. Step 3: Cross multiply
   2,758.78x = 4,139.52 × 1,298.08
4. Step 4: Simplify right side
   2,758.78x = 5,373,428.12
5. Step 5: Solve for x
   x = 5,373,428.12/2,758.78
6. Step 6: Final answer
   x = 1,947.76