Finding the Fourth Proportional to 1,554.54, 2,145.30 and 891.74

Step by Step Solution

1. Step 1: Write the proportion equation
   1,554.54 : 2,145.30 = 891.74 : x
2. Step 2: Convert to fraction form
   1,554.54/2,145.30 = 891.74/x
3. Step 3: Cross multiply
   1,554.54x = 2,145.30 × 891.74
4. Step 4: Simplify right side
   1,554.54x = 1,913,049.82
5. Step 5: Solve for x
   x = 1,913,049.82/1,554.54
6. Step 6: Final answer
   x = 1,230.62