Finding the Fourth Proportional to 8,870.43, 12,246.90 and 5,517.81

Step by Step Solution

1. Step 1: Write the proportion equation
   8,870.43 : 12,246.90 = 5,517.81 : x
2. Step 2: Convert to fraction form
   8,870.43/12,246.90 = 5,517.81/x
3. Step 3: Cross multiply
   8,870.43x = 12,246.90 × 5,517.81
4. Step 4: Simplify right side
   8,870.43x = 67,576,067.29
5. Step 5: Solve for x
   x = 67,576,067.29/8,870.43
6. Step 6: Final answer
   x = 7,618.13