Finding the Fourth Proportional to 15,665.76, 21,615.61 and 8,953.59

Step by Step Solution

1. Step 1: Write the proportion equation
   15,665.76 : 21,615.61 = 8,953.59 : x
2. Step 2: Convert to fraction form
   15,665.76/21,615.61 = 8,953.59/x
3. Step 3: Cross multiply
   15,665.76x = 21,615.61 × 8,953.59
4. Step 4: Simplify right side
   15,665.76x = 193,537,309.54
5. Step 5: Solve for x
   x = 193,537,309.54/15,665.76
6. Step 6: Final answer
   x = 12,354.16