Finding the Fourth Proportional to 1,558.65, 2,150.94 and 860.02

Step by Step Solution

1. Step 1: Write the proportion equation
   1,558.65 : 2,150.94 = 860.02 : x
2. Step 2: Convert to fraction form
   1,558.65/2,150.94 = 860.02/x
3. Step 3: Cross multiply
   1,558.65x = 2,150.94 × 860.02
4. Step 4: Simplify right side
   1,558.65x = 1,849,851.42
5. Step 5: Solve for x
   x = 1,849,851.42/1,558.65
6. Step 6: Final answer
   x = 1,186.83