Finding the Fourth Proportional to 8,621.47, 12,906.69 and 5,323.96

Step by Step Solution

1. Step 1: Write the proportion equation
   8,621.47 : 12,906.69 = 5,323.96 : x
2. Step 2: Convert to fraction form
   8,621.47/12,906.69 = 5,323.96/x
3. Step 3: Cross multiply
   8,621.47x = 12,906.69 × 5,323.96
4. Step 4: Simplify right side
   8,621.47x = 68,714,701.29
5. Step 5: Solve for x
   x = 68,714,701.29/8,621.47
6. Step 6: Final answer
   x = 7,970.18