Finding the Fourth Proportional to 9,819.78, 13,551.42 and 5,628

Step by Step Solution

1. Step 1: Write the proportion equation
   9,819.78 : 13,551.42 = 5,628 : x
2. Step 2: Convert to fraction form
   9,819.78/13,551.42 = 5,628/x
3. Step 3: Cross multiply
   9,819.78x = 13,551.42 × 5,628
4. Step 4: Simplify right side
   9,819.78x = 76,267,391.76
5. Step 5: Solve for x
   x = 76,267,391.76/9,819.78
6. Step 6: Final answer
   x = 7,766.71