Finding the Fourth Proportional to 15,715.62, 21,688.81 and 9,003.45

Step by Step Solution

1. Step 1: Write the proportion equation
   15,715.62 : 21,688.81 = 9,003.45 : x
2. Step 2: Convert to fraction form
   15,715.62/21,688.81 = 9,003.45/x
3. Step 3: Cross multiply
   15,715.62x = 21,688.81 × 9,003.45
4. Step 4: Simplify right side
   15,715.62x = 195,274,225.86
5. Step 5: Solve for x
   x = 195,274,225.86/15,715.62
6. Step 6: Final answer
   x = 12,425.49