Finding the Fourth Proportional to 21,086.98, 29,098.95 and 11,653.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,086.98 : 29,098.95 = 11,653.72 : x
2. Step 2: Convert to fraction form
   21,086.98/29,098.95 = 11,653.72/x
3. Step 3: Cross multiply
   21,086.98x = 29,098.95 × 11,653.72
4. Step 4: Simplify right side
   21,086.98x = 339,111,015.59
5. Step 5: Solve for x
   x = 339,111,015.59/21,086.98
6. Step 6: Final answer
   x = 16,081.54