Finding the Fourth Proportional to 21,005.99, 29,016.59 and 19,511.30

Step by Step Solution

1. Step 1: Write the proportion equation
   21,005.99 : 29,016.59 = 19,511.30 : x
2. Step 2: Convert to fraction form
   21,005.99/29,016.59 = 19,511.30/x
3. Step 3: Cross multiply
   21,005.99x = 29,016.59 × 19,511.30
4. Step 4: Simplify right side
   21,005.99x = 566,151,367.45
5. Step 5: Solve for x
   x = 566,151,367.45/21,005.99
6. Step 6: Final answer
   x = 26,951.90