Finding the Fourth Proportional to 15,499.34, 21,388.82 and 8,425.71

Step by Step Solution

1. Step 1: Write the proportion equation
   15,499.34 : 21,388.82 = 8,425.71 : x
2. Step 2: Convert to fraction form
   15,499.34/21,388.82 = 8,425.71/x
3. Step 3: Cross multiply
   15,499.34x = 21,388.82 × 8,425.71
4. Step 4: Simplify right side
   15,499.34x = 180,215,994.56
5. Step 5: Solve for x
   x = 180,215,994.56/15,499.34
6. Step 6: Final answer
   x = 11,627.33