Finding the Fourth Proportional to 21,101.28, 31,667.49 and 10,007.94

Step by Step Solution

1. Step 1: Write the proportion equation
   21,101.28 : 31,667.49 = 10,007.94 : x
2. Step 2: Convert to fraction form
   21,101.28/31,667.49 = 10,007.94/x
3. Step 3: Cross multiply
   21,101.28x = 31,667.49 × 10,007.94
4. Step 4: Simplify right side
   21,101.28x = 316,926,339.87
5. Step 5: Solve for x
   x = 316,926,339.87/21,101.28
6. Step 6: Final answer
   x = 15,019.29