Finding the Fourth Proportional to 15,404.24, 21,256.34 and 8,689.08

Step by Step Solution

1. Step 1: Write the proportion equation
   15,404.24 : 21,256.34 = 8,689.08 : x
2. Step 2: Convert to fraction form
   15,404.24/21,256.34 = 8,689.08/x
3. Step 3: Cross multiply
   15,404.24x = 21,256.34 × 8,689.08
4. Step 4: Simplify right side
   15,404.24x = 184,698,038.77
5. Step 5: Solve for x
   x = 184,698,038.77/15,404.24
6. Step 6: Final answer
   x = 11,990.08