Finding the Fourth Proportional to 1,141.58, 1,575.45 and 861.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,141.58 : 1,575.45 = 861.32 : x
2. Step 2: Convert to fraction form
   1,141.58/1,575.45 = 861.32/x
3. Step 3: Cross multiply
   1,141.58x = 1,575.45 × 861.32
4. Step 4: Simplify right side
   1,141.58x = 1,356,958.72
5. Step 5: Solve for x
   x = 1,356,958.72/1,141.58
6. Step 6: Final answer
   x = 1,188.67