Finding the Fourth Proportional to 21,015.99, 29,015.57 and 13,069.02

Step by Step Solution

1. Step 1: Write the proportion equation
   21,015.99 : 29,015.57 = 13,069.02 : x
2. Step 2: Convert to fraction form
   21,015.99/29,015.57 = 13,069.02/x
3. Step 3: Cross multiply
   21,015.99x = 29,015.57 × 13,069.02
4. Step 4: Simplify right side
   21,015.99x = 379,204,999.30
5. Step 5: Solve for x
   x = 379,204,999.30/21,015.99
6. Step 6: Final answer
   x = 18,043.64