Finding the Fourth Proportional to 1,084.78, 1,628.52 and 904.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,084.78 : 1,628.52 = 904.42 : x
2. Step 2: Convert to fraction form
   1,084.78/1,628.52 = 904.42/x
3. Step 3: Cross multiply
   1,084.78x = 1,628.52 × 904.42
4. Step 4: Simplify right side
   1,084.78x = 1,472,866.06
5. Step 5: Solve for x
   x = 1,472,866.06/1,084.78
6. Step 6: Final answer
   x = 1,357.76