Finding the Fourth Proportional to 8,554.17, 12,819.59 and 5,428.58

Step by Step Solution

1. Step 1: Write the proportion equation
   8,554.17 : 12,819.59 = 5,428.58 : x
2. Step 2: Convert to fraction form
   8,554.17/12,819.59 = 5,428.58/x
3. Step 3: Cross multiply
   8,554.17x = 12,819.59 × 5,428.58
4. Step 4: Simplify right side
   8,554.17x = 69,592,099.00
5. Step 5: Solve for x
   x = 69,592,099.00/8,554.17
6. Step 6: Final answer
   x = 8,135.46