Finding the Fourth Proportional to 1,142.79, 1,575.52 and 858.00

Step by Step Solution

1. Step 1: Write the proportion equation
   1,142.79 : 1,575.52 = 858.00 : x
2. Step 2: Convert to fraction form
   1,142.79/1,575.52 = 858.00/x
3. Step 3: Cross multiply
   1,142.79x = 1,575.52 × 858.00
4. Step 4: Simplify right side
   1,142.79x = 1,351,788.11
5. Step 5: Solve for x
   x = 1,351,788.11/1,142.79
6. Step 6: Final answer
   x = 1,182.89