Finding the Fourth Proportional to 21,080.43, 29,104.56 and 13,530.02

Step by Step Solution

1. Step 1: Write the proportion equation
   21,080.43 : 29,104.56 = 13,530.02 : x
2. Step 2: Convert to fraction form
   21,080.43/29,104.56 = 13,530.02/x
3. Step 3: Cross multiply
   21,080.43x = 29,104.56 × 13,530.02
4. Step 4: Simplify right side
   21,080.43x = 393,785,278.89
5. Step 5: Solve for x
   x = 393,785,278.89/21,080.43
6. Step 6: Final answer
   x = 18,680.14