Finding the Fourth Proportional to 8,605.86, 12,930.42 and 5,487.30

Step by Step Solution

1. Step 1: Write the proportion equation
   8,605.86 : 12,930.42 = 5,487.30 : x
2. Step 2: Convert to fraction form
   8,605.86/12,930.42 = 5,487.30/x
3. Step 3: Cross multiply
   8,605.86x = 12,930.42 × 5,487.30
4. Step 4: Simplify right side
   8,605.86x = 70,953,093.67
5. Step 5: Solve for x
   x = 70,953,093.67/8,605.86
6. Step 6: Final answer
   x = 8,244.74