Finding the Fourth Proportional to 8,560.38, 12,819.59 and 7,070.49

Step by Step Solution

1. Step 1: Write the proportion equation
   8,560.38 : 12,819.59 = 7,070.49 : x
2. Step 2: Convert to fraction form
   8,560.38/12,819.59 = 7,070.49/x
3. Step 3: Cross multiply
   8,560.38x = 12,819.59 × 7,070.49
4. Step 4: Simplify right side
   8,560.38x = 90,640,747.55
5. Step 5: Solve for x
   x = 90,640,747.55/8,560.38
6. Step 6: Final answer
   x = 10,588.40