Finding the Fourth Proportional to 1,136.89, 1,704.55 and 580.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,136.89 : 1,704.55 = 580.52 : x
2. Step 2: Convert to fraction form
   1,136.89/1,704.55 = 580.52/x
3. Step 3: Cross multiply
   1,136.89x = 1,704.55 × 580.52
4. Step 4: Simplify right side
   1,136.89x = 989,525.37
5. Step 5: Solve for x
   x = 989,525.37/1,136.89
6. Step 6: Final answer
   x = 870.38