Finding the Fourth Proportional to 1,152.72, 1,589.78 and 858.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,152.72 : 1,589.78 = 858.69 : x
2. Step 2: Convert to fraction form
   1,152.72/1,589.78 = 858.69/x
3. Step 3: Cross multiply
   1,152.72x = 1,589.78 × 858.69
4. Step 4: Simplify right side
   1,152.72x = 1,365,123.89
5. Step 5: Solve for x
   x = 1,365,123.89/1,152.72
6. Step 6: Final answer
   x = 1,184.26