Finding the Fourth Proportional to 8,990.43, 13,491.86 and 3,147

Step by Step Solution

1. Step 1: Write the proportion equation
   8,990.43 : 13,491.86 = 3,147 : x
2. Step 2: Convert to fraction form
   8,990.43/13,491.86 = 3,147/x
3. Step 3: Cross multiply
   8,990.43x = 13,491.86 × 3,147
4. Step 4: Simplify right side
   8,990.43x = 42,458,867.69
5. Step 5: Solve for x
   x = 42,458,867.69/8,990.43
6. Step 6: Final answer
   x = 4,722.67