Finding the Fourth Proportional to 1,558.45, 2,150.57 and 859.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,558.45 : 2,150.57 = 859.82 : x
2. Step 2: Convert to fraction form
   1,558.45/2,150.57 = 859.82/x
3. Step 3: Cross multiply
   1,558.45x = 2,150.57 × 859.82
4. Step 4: Simplify right side
   1,558.45x = 1,849,098.80
5. Step 5: Solve for x
   x = 1,849,098.80/1,558.45
6. Step 6: Final answer
   x = 1,186.50