Finding the Fourth Proportional to 13,309.30, 18,366.15 and 7,339.78

Step by Step Solution

1. Step 1: Write the proportion equation
   13,309.30 : 18,366.15 = 7,339.78 : x
2. Step 2: Convert to fraction form
   13,309.30/18,366.15 = 7,339.78/x
3. Step 3: Cross multiply
   13,309.30x = 18,366.15 × 7,339.78
4. Step 4: Simplify right side
   13,309.30x = 134,803,500.45
5. Step 5: Solve for x
   x = 134,803,500.45/13,309.30
6. Step 6: Final answer
   x = 10,128.52