Finding the Fourth Proportional to 11,990.18, 17,974.92 and 5,321.72

Step by Step Solution

1. Step 1: Write the proportion equation
   11,990.18 : 17,974.92 = 5,321.72 : x
2. Step 2: Convert to fraction form
   11,990.18/17,974.92 = 5,321.72/x
3. Step 3: Cross multiply
   11,990.18x = 17,974.92 × 5,321.72
4. Step 4: Simplify right side
   11,990.18x = 95,657,491.26
5. Step 5: Solve for x
   x = 95,657,491.26/11,990.18
6. Step 6: Final answer
   x = 7,977.99