Finding the Fourth Proportional to 12,582.76, 18,870.30 and 8,223.40

Step by Step Solution

1. Step 1: Write the proportion equation
   12,582.76 : 18,870.30 = 8,223.40 : x
2. Step 2: Convert to fraction form
   12,582.76/18,870.30 = 8,223.40/x
3. Step 3: Cross multiply
   12,582.76x = 18,870.30 × 8,223.40
4. Step 4: Simplify right side
   12,582.76x = 155,178,025.02
5. Step 5: Solve for x
   x = 155,178,025.02/12,582.76
6. Step 6: Final answer
   x = 12,332.59