Finding the Fourth Proportional to 1,369.31, 1,890.24 and 928.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,369.31 : 1,890.24 = 928.49 : x
2. Step 2: Convert to fraction form
   1,369.31/1,890.24 = 928.49/x
3. Step 3: Cross multiply
   1,369.31x = 1,890.24 × 928.49
4. Step 4: Simplify right side
   1,369.31x = 1,755,068.94
5. Step 5: Solve for x
   x = 1,755,068.94/1,369.31
6. Step 6: Final answer
   x = 1,281.72