Finding the Fourth Proportional to 1,554.69, 2,145.22 and 891.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,554.69 : 2,145.22 = 891.42 : x
2. Step 2: Convert to fraction form
   1,554.69/2,145.22 = 891.42/x
3. Step 3: Cross multiply
   1,554.69x = 2,145.22 × 891.42
4. Step 4: Simplify right side
   1,554.69x = 1,912,292.01
5. Step 5: Solve for x
   x = 1,912,292.01/1,554.69
6. Step 6: Final answer
   x = 1,230.01