Finding the Fourth Proportional to 2,858.78, 4,288.47 and 910.53

Step by Step Solution

1. Step 1: Write the proportion equation
   2,858.78 : 4,288.47 = 910.53 : x
2. Step 2: Convert to fraction form
   2,858.78/4,288.47 = 910.53/x
3. Step 3: Cross multiply
   2,858.78x = 4,288.47 × 910.53
4. Step 4: Simplify right side
   2,858.78x = 3,904,780.59
5. Step 5: Solve for x
   x = 3,904,780.59/2,858.78
6. Step 6: Final answer
   x = 1,365.89