Finding the Fourth Proportional to 1,554.63, 2,144.72 and 891.33

Step by Step Solution

1. Step 1: Write the proportion equation
   1,554.63 : 2,144.72 = 891.33 : x
2. Step 2: Convert to fraction form
   1,554.63/2,144.72 = 891.33/x
3. Step 3: Cross multiply
   1,554.63x = 2,144.72 × 891.33
4. Step 4: Simplify right side
   1,554.63x = 1,911,648.82
5. Step 5: Solve for x
   x = 1,911,648.82/1,554.63
6. Step 6: Final answer
   x = 1,229.65