Finding the Fourth Proportional to 8,411.86, 12,619.27 and 3,478.74

Step by Step Solution

1. Step 1: Write the proportion equation
   8,411.86 : 12,619.27 = 3,478.74 : x
2. Step 2: Convert to fraction form
   8,411.86/12,619.27 = 3,478.74/x
3. Step 3: Cross multiply
   8,411.86x = 12,619.27 × 3,478.74
4. Step 4: Simplify right side
   8,411.86x = 43,899,096.22
5. Step 5: Solve for x
   x = 43,899,096.22/8,411.86
6. Step 6: Final answer
   x = 5,218.71