Finding the Fourth Proportional to 1,142.07, 1,576.04 and 618.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,142.07 : 1,576.04 = 618.10 : x
2. Step 2: Convert to fraction form
   1,142.07/1,576.04 = 618.10/x
3. Step 3: Cross multiply
   1,142.07x = 1,576.04 × 618.10
4. Step 4: Simplify right side
   1,142.07x = 974,150.32
5. Step 5: Solve for x
   x = 974,150.32/1,142.07
6. Step 6: Final answer
   x = 852.97