Finding the Fourth Proportional to 1,359.41, 1,874.90 and 861.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,359.41 : 1,874.90 = 861.57 : x
2. Step 2: Convert to fraction form
   1,359.41/1,874.90 = 861.57/x
3. Step 3: Cross multiply
   1,359.41x = 1,874.90 × 861.57
4. Step 4: Simplify right side
   1,359.41x = 1,615,359.75
5. Step 5: Solve for x
   x = 1,615,359.75/1,359.41
6. Step 6: Final answer
   x = 1,188.28