Finding the Fourth Proportional to 21,085.98, 29,097.57 and 11,652.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,085.98 : 29,097.57 = 11,652.72 : x
2. Step 2: Convert to fraction form
   21,085.98/29,097.57 = 11,652.72/x
3. Step 3: Cross multiply
   21,085.98x = 29,097.57 × 11,652.72
4. Step 4: Simplify right side
   21,085.98x = 339,065,835.89
5. Step 5: Solve for x
   x = 339,065,835.89/21,085.98
6. Step 6: Final answer
   x = 16,080.16