Finding the Fourth Proportional to 1,558.69, 2,150.89 and 860.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,558.69 : 2,150.89 = 860.07 : x
2. Step 2: Convert to fraction form
   1,558.69/2,150.89 = 860.07/x
3. Step 3: Cross multiply
   1,558.69x = 2,150.89 × 860.07
4. Step 4: Simplify right side
   1,558.69x = 1,849,915.96
5. Step 5: Solve for x
   x = 1,849,915.96/1,558.69
6. Step 6: Final answer
   x = 1,186.84