Finding the Fourth Proportional to 28,300.59, 42,442.65 and 8,579.25

Step by Step Solution

1. Step 1: Write the proportion equation
   28,300.59 : 42,442.65 = 8,579.25 : x
2. Step 2: Convert to fraction form
   28,300.59/42,442.65 = 8,579.25/x
3. Step 3: Cross multiply
   28,300.59x = 42,442.65 × 8,579.25
4. Step 4: Simplify right side
   28,300.59x = 364,126,105.01
5. Step 5: Solve for x
   x = 364,126,105.01/28,300.59
6. Step 6: Final answer
   x = 12,866.38