Finding the Fourth Proportional to 2,853.72, 4,280.73 and 906.07

Step by Step Solution

1. Step 1: Write the proportion equation
   2,853.72 : 4,280.73 = 906.07 : x
2. Step 2: Convert to fraction form
   2,853.72/4,280.73 = 906.07/x
3. Step 3: Cross multiply
   2,853.72x = 4,280.73 × 906.07
4. Step 4: Simplify right side
   2,853.72x = 3,878,641.03
5. Step 5: Solve for x
   x = 3,878,641.03/2,853.72
6. Step 6: Final answer
   x = 1,359.15