Finding the Fourth Proportional to 1,554.50, 2,145.17 and 891.51

Step by Step Solution

1. Step 1: Write the proportion equation
   1,554.50 : 2,145.17 = 891.51 : x
2. Step 2: Convert to fraction form
   1,554.50/2,145.17 = 891.51/x
3. Step 3: Cross multiply
   1,554.50x = 2,145.17 × 891.51
4. Step 4: Simplify right side
   1,554.50x = 1,912,436.05
5. Step 5: Solve for x
   x = 1,912,436.05/1,554.50
6. Step 6: Final answer
   x = 1,230.26