Finding the Fourth Proportional to 11,986.38, 17,978.76 and 11,174.76

Step by Step Solution

1. Step 1: Write the proportion equation
   11,986.38 : 17,978.76 = 11,174.76 : x
2. Step 2: Convert to fraction form
   11,986.38/17,978.76 = 11,174.76/x
3. Step 3: Cross multiply
   11,986.38x = 17,978.76 × 11,174.76
4. Step 4: Simplify right side
   11,986.38x = 200,908,328.10
5. Step 5: Solve for x
   x = 200,908,328.10/11,986.38
6. Step 6: Final answer
   x = 16,761.38