Finding the Fourth Proportional to 21,002.67, 31,516.49 and 10,615.47

Step by Step Solution

1. Step 1: Write the proportion equation
   21,002.67 : 31,516.49 = 10,615.47 : x
2. Step 2: Convert to fraction form
   21,002.67/31,516.49 = 10,615.47/x
3. Step 3: Cross multiply
   21,002.67x = 31,516.49 × 10,615.47
4. Step 4: Simplify right side
   21,002.67x = 334,562,301.02
5. Step 5: Solve for x
   x = 334,562,301.02/21,002.67
6. Step 6: Final answer
   x = 15,929.51