Finding the Fourth Proportional to 1,111.36, 1,664.34 and 648.14

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.36 : 1,664.34 = 648.14 : x
2. Step 2: Convert to fraction form
   1,111.36/1,664.34 = 648.14/x
3. Step 3: Cross multiply
   1,111.36x = 1,664.34 × 648.14
4. Step 4: Simplify right side
   1,111.36x = 1,078,725.33
5. Step 5: Solve for x
   x = 1,078,725.33/1,111.36
6. Step 6: Final answer
   x = 970.64