Finding the Fourth Proportional to 8,648.30, 12,988.83 and 5,384.18

Step by Step Solution

1. Step 1: Write the proportion equation
   8,648.30 : 12,988.83 = 5,384.18 : x
2. Step 2: Convert to fraction form
   8,648.30/12,988.83 = 5,384.18/x
3. Step 3: Cross multiply
   8,648.30x = 12,988.83 × 5,384.18
4. Step 4: Simplify right side
   8,648.30x = 69,934,198.71
5. Step 5: Solve for x
   x = 69,934,198.71/8,648.30
6. Step 6: Final answer
   x = 8,086.47