Finding the Fourth Proportional to 21,018.52, 29,007.59 and 15,704.11

Step by Step Solution

1. Step 1: Write the proportion equation
   21,018.52 : 29,007.59 = 15,704.11 : x
2. Step 2: Convert to fraction form
   21,018.52/29,007.59 = 15,704.11/x
3. Step 3: Cross multiply
   21,018.52x = 29,007.59 × 15,704.11
4. Step 4: Simplify right side
   21,018.52x = 455,538,384.19
5. Step 5: Solve for x
   x = 455,538,384.19/21,018.52
6. Step 6: Final answer
   x = 21,673.19