Finding the Fourth Proportional to 1,347.78, 1,859.90 and 758.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,347.78 : 1,859.90 = 758.28 : x
2. Step 2: Convert to fraction form
   1,347.78/1,859.90 = 758.28/x
3. Step 3: Cross multiply
   1,347.78x = 1,859.90 × 758.28
4. Step 4: Simplify right side
   1,347.78x = 1,410,321.18
5. Step 5: Solve for x
   x = 1,410,321.18/1,347.78
6. Step 6: Final answer
   x = 1,046.40