Finding the Fourth Proportional to 1,601.42, 2,401.64 and 860.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,601.42 : 2,401.64 = 860.57 : x
2. Step 2: Convert to fraction form
   1,601.42/2,401.64 = 860.57/x
3. Step 3: Cross multiply
   1,601.42x = 2,401.64 × 860.57
4. Step 4: Simplify right side
   1,601.42x = 2,066,779.33
5. Step 5: Solve for x
   x = 2,066,779.33/1,601.42
6. Step 6: Final answer
   x = 1,290.60