Finding the Fourth Proportional to 1,369.28, 1,890.56 and 904.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,369.28 : 1,890.56 = 904.48 : x
2. Step 2: Convert to fraction form
   1,369.28/1,890.56 = 904.48/x
3. Step 3: Cross multiply
   1,369.28x = 1,890.56 × 904.48
4. Step 4: Simplify right side
   1,369.28x = 1,709,973.71
5. Step 5: Solve for x
   x = 1,709,973.71/1,369.28
6. Step 6: Final answer
   x = 1,248.81