Finding the Fourth Proportional to 22,659, 31,271.65 and 13,099.30

Step by Step Solution

1. Step 1: Write the proportion equation
   22,659 : 31,271.65 = 13,099.30 : x
2. Step 2: Convert to fraction form
   22,659/31,271.65 = 13,099.30/x
3. Step 3: Cross multiply
   22,659x = 31,271.65 × 13,099.30
4. Step 4: Simplify right side
   22,659x = 409,636,724.85
5. Step 5: Solve for x
   x = 409,636,724.85/22,659
6. Step 6: Final answer
   x = 18,078.32