Finding the Fourth Proportional to 8,671.84, 13,012.96 and 3,124.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,671.84 : 13,012.96 = 3,124.72 : x
2. Step 2: Convert to fraction form
   8,671.84/13,012.96 = 3,124.72/x
3. Step 3: Cross multiply
   8,671.84x = 13,012.96 × 3,124.72
4. Step 4: Simplify right side
   8,671.84x = 40,661,856.37
5. Step 5: Solve for x
   x = 40,661,856.37/8,671.84
6. Step 6: Final answer
   x = 4,688.95