Finding the Fourth Proportional to 21,053.27, 29,053.49 and 13,499.60

Step by Step Solution

1. Step 1: Write the proportion equation
   21,053.27 : 29,053.49 = 13,499.60 : x
2. Step 2: Convert to fraction form
   21,053.27/29,053.49 = 13,499.60/x
3. Step 3: Cross multiply
   21,053.27x = 29,053.49 × 13,499.60
4. Step 4: Simplify right side
   21,053.27x = 392,210,280.84
5. Step 5: Solve for x
   x = 392,210,280.84/21,053.27
6. Step 6: Final answer
   x = 18,629.43