Finding the Fourth Proportional to 1,111.49, 1,665.19 and 648.44

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.49 : 1,665.19 = 648.44 : x
2. Step 2: Convert to fraction form
   1,111.49/1,665.19 = 648.44/x
3. Step 3: Cross multiply
   1,111.49x = 1,665.19 × 648.44
4. Step 4: Simplify right side
   1,111.49x = 1,079,774.53
5. Step 5: Solve for x
   x = 1,079,774.53/1,111.49
6. Step 6: Final answer
   x = 971.47