Finding the Fourth Proportional to 8,619.72, 12,929.33 and 2,380.12

Step by Step Solution

1. Step 1: Write the proportion equation
   8,619.72 : 12,929.33 = 2,380.12 : x
2. Step 2: Convert to fraction form
   8,619.72/12,929.33 = 2,380.12/x
3. Step 3: Cross multiply
   8,619.72x = 12,929.33 × 2,380.12
4. Step 4: Simplify right side
   8,619.72x = 30,773,280.37
5. Step 5: Solve for x
   x = 30,773,280.37/8,619.72
6. Step 6: Final answer
   x = 3,570.10