Finding the Fourth Proportional to 1,141.98, 1,576 and 861.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,141.98 : 1,576 = 861.72 : x
2. Step 2: Convert to fraction form
   1,141.98/1,576 = 861.72/x
3. Step 3: Cross multiply
   1,141.98x = 1,576 × 861.72
4. Step 4: Simplify right side
   1,141.98x = 1,358,070.72
5. Step 5: Solve for x
   x = 1,358,070.72/1,141.98
6. Step 6: Final answer
   x = 1,189.22