Finding the Fourth Proportional to 20,551, 28,355.43 and 12,484.42

Step by Step Solution

1. Step 1: Write the proportion equation
   20,551 : 28,355.43 = 12,484.42 : x
2. Step 2: Convert to fraction form
   20,551/28,355.43 = 12,484.42/x
3. Step 3: Cross multiply
   20,551x = 28,355.43 × 12,484.42
4. Step 4: Simplify right side
   20,551x = 354,001,097.40
5. Step 5: Solve for x
   x = 354,001,097.40/20,551
6. Step 6: Final answer
   x = 17,225.49