Finding the Fourth Proportional to 8,436.40, 12,656.72 and 3,818.16

Step by Step Solution

1. Step 1: Write the proportion equation
   8,436.40 : 12,656.72 = 3,818.16 : x
2. Step 2: Convert to fraction form
   8,436.40/12,656.72 = 3,818.16/x
3. Step 3: Cross multiply
   8,436.40x = 12,656.72 × 3,818.16
4. Step 4: Simplify right side
   8,436.40x = 48,325,382.04
5. Step 5: Solve for x
   x = 48,325,382.04/8,436.40
6. Step 6: Final answer
   x = 5,728.20