Finding the Fourth Proportional to 2,659.38, 3,989.68 and 904.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,659.38 : 3,989.68 = 904.28 : x
2. Step 2: Convert to fraction form
   2,659.38/3,989.68 = 904.28/x
3. Step 3: Cross multiply
   2,659.38x = 3,989.68 × 904.28
4. Step 4: Simplify right side
   2,659.38x = 3,607,787.83
5. Step 5: Solve for x
   x = 3,607,787.83/2,659.38
6. Step 6: Final answer
   x = 1,356.63