Finding the Fourth Proportional to 1,525.70, 2,105.57 and 862.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,525.70 : 2,105.57 = 862.31 : x
2. Step 2: Convert to fraction form
   1,525.70/2,105.57 = 862.31/x
3. Step 3: Cross multiply
   1,525.70x = 2,105.57 × 862.31
4. Step 4: Simplify right side
   1,525.70x = 1,815,661.49
5. Step 5: Solve for x
   x = 1,815,661.49/1,525.70
6. Step 6: Final answer
   x = 1,190.05