Finding the Fourth Proportional to 12,640.89, 18,924.61 and 7,359.79

Step by Step Solution

1. Step 1: Write the proportion equation
   12,640.89 : 18,924.61 = 7,359.79 : x
2. Step 2: Convert to fraction form
   12,640.89/18,924.61 = 7,359.79/x
3. Step 3: Cross multiply
   12,640.89x = 18,924.61 × 7,359.79
4. Step 4: Simplify right side
   12,640.89x = 139,281,155.43
5. Step 5: Solve for x
   x = 139,281,155.43/12,640.89
6. Step 6: Final answer
   x = 11,018.30