Finding the Fourth Proportional to 1,551.38, 2,327.34 and 821.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,551.38 : 2,327.34 = 821.57 : x
2. Step 2: Convert to fraction form
   1,551.38/2,327.34 = 821.57/x
3. Step 3: Cross multiply
   1,551.38x = 2,327.34 × 821.57
4. Step 4: Simplify right side
   1,551.38x = 1,912,072.72
5. Step 5: Solve for x
   x = 1,912,072.72/1,551.38
6. Step 6: Final answer
   x = 1,232.50