Finding the Fourth Proportional to 28,301.37, 42,452.18 and 8,580.10

Step by Step Solution

1. Step 1: Write the proportion equation
   28,301.37 : 42,452.18 = 8,580.10 : x
2. Step 2: Convert to fraction form
   28,301.37/42,452.18 = 8,580.10/x
3. Step 3: Cross multiply
   28,301.37x = 42,452.18 × 8,580.10
4. Step 4: Simplify right side
   28,301.37x = 364,244,007.63
5. Step 5: Solve for x
   x = 364,244,007.63/28,301.37
6. Step 6: Final answer
   x = 12,870.19