Finding the Fourth Proportional to 15,726.91, 21,700.71 and 9,353.37

Step by Step Solution

1. Step 1: Write the proportion equation
   15,726.91 : 21,700.71 = 9,353.37 : x
2. Step 2: Convert to fraction form
   15,726.91/21,700.71 = 9,353.37/x
3. Step 3: Cross multiply
   15,726.91x = 21,700.71 × 9,353.37
4. Step 4: Simplify right side
   15,726.91x = 202,974,851.27
5. Step 5: Solve for x
   x = 202,974,851.27/15,726.91
6. Step 6: Final answer
   x = 12,906.21