Finding the Fourth Proportional to 1,142.02, 1,575.98 and 618.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,142.02 : 1,575.98 = 618.05 : x
2. Step 2: Convert to fraction form
   1,142.02/1,575.98 = 618.05/x
3. Step 3: Cross multiply
   1,142.02x = 1,575.98 × 618.05
4. Step 4: Simplify right side
   1,142.02x = 974,034.44
5. Step 5: Solve for x
   x = 974,034.44/1,142.02
6. Step 6: Final answer
   x = 852.90