Finding the Fourth Proportional to 21,041.40, 29,024.89 and 13,485.05

Step by Step Solution

1. Step 1: Write the proportion equation
   21,041.40 : 29,024.89 = 13,485.05 : x
2. Step 2: Convert to fraction form
   21,041.40/29,024.89 = 13,485.05/x
3. Step 3: Cross multiply
   21,041.40x = 29,024.89 × 13,485.05
4. Step 4: Simplify right side
   21,041.40x = 391,401,914.06
5. Step 5: Solve for x
   x = 391,401,914.06/21,041.40
6. Step 6: Final answer
   x = 18,601.51