Finding the Fourth Proportional to 21,379.88, 32,077.12 and 11,520.18

Step by Step Solution

1. Step 1: Write the proportion equation
   21,379.88 : 32,077.12 = 11,520.18 : x
2. Step 2: Convert to fraction form
   21,379.88/32,077.12 = 11,520.18/x
3. Step 3: Cross multiply
   21,379.88x = 32,077.12 × 11,520.18
4. Step 4: Simplify right side
   21,379.88x = 369,534,196.28
5. Step 5: Solve for x
   x = 369,534,196.28/21,379.88
6. Step 6: Final answer
   x = 17,284.20