Finding the Fourth Proportional to 1,348.78, 1,860.94 and 906.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,348.78 : 1,860.94 = 906.79 : x
2. Step 2: Convert to fraction form
   1,348.78/1,860.94 = 906.79/x
3. Step 3: Cross multiply
   1,348.78x = 1,860.94 × 906.79
4. Step 4: Simplify right side
   1,348.78x = 1,687,481.78
5. Step 5: Solve for x
   x = 1,687,481.78/1,348.78
6. Step 6: Final answer
   x = 1,251.12