Finding the Fourth Proportional to 1,408.88, 2,111.52 and 668.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,408.88 : 2,111.52 = 668.49 : x
2. Step 2: Convert to fraction form
   1,408.88/2,111.52 = 668.49/x
3. Step 3: Cross multiply
   1,408.88x = 2,111.52 × 668.49
4. Step 4: Simplify right side
   1,408.88x = 1,411,530.00
5. Step 5: Solve for x
   x = 1,411,530.00/1,408.88
6. Step 6: Final answer
   x = 1,001.88