Finding the Fourth Proportional to 1,554.31, 2,144.88 and 891.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,554.31 : 2,144.88 = 891.12 : x
2. Step 2: Convert to fraction form
   1,554.31/2,144.88 = 891.12/x
3. Step 3: Cross multiply
   1,554.31x = 2,144.88 × 891.12
4. Step 4: Simplify right side
   1,554.31x = 1,911,345.47
5. Step 5: Solve for x
   x = 1,911,345.47/1,554.31
6. Step 6: Final answer
   x = 1,229.71