Finding the Fourth Proportional to 8,172.84, 12,264.72 and 2,978.73

Step by Step Solution

1. Step 1: Write the proportion equation
   8,172.84 : 12,264.72 = 2,978.73 : x
2. Step 2: Convert to fraction form
   8,172.84/12,264.72 = 2,978.73/x
3. Step 3: Cross multiply
   8,172.84x = 12,264.72 × 2,978.73
4. Step 4: Simplify right side
   8,172.84x = 36,533,289.41
5. Step 5: Solve for x
   x = 36,533,289.41/8,172.84
6. Step 6: Final answer
   x = 4,470.08