Finding the Fourth Proportional to 1,142.33, 1,576.41 and 618.36

Step by Step Solution

1. Step 1: Write the proportion equation
   1,142.33 : 1,576.41 = 618.36 : x
2. Step 2: Convert to fraction form
   1,142.33/1,576.41 = 618.36/x
3. Step 3: Cross multiply
   1,142.33x = 1,576.41 × 618.36
4. Step 4: Simplify right side
   1,142.33x = 974,788.89
5. Step 5: Solve for x
   x = 974,788.89/1,142.33
6. Step 6: Final answer
   x = 853.34