Finding the Fourth Proportional to 8,575.81, 12,869.86 and 3,648.91

Step by Step Solution

1. Step 1: Write the proportion equation
   8,575.81 : 12,869.86 = 3,648.91 : x
2. Step 2: Convert to fraction form
   8,575.81/12,869.86 = 3,648.91/x
3. Step 3: Cross multiply
   8,575.81x = 12,869.86 × 3,648.91
4. Step 4: Simplify right side
   8,575.81x = 46,960,933.24
5. Step 5: Solve for x
   x = 46,960,933.24/8,575.81
6. Step 6: Final answer
   x = 5,475.98