Finding the Fourth Proportional to 13,290.13, 18,340.59 and 7,321.74

Step by Step Solution

1. Step 1: Write the proportion equation
   13,290.13 : 18,340.59 = 7,321.74 : x
2. Step 2: Convert to fraction form
   13,290.13/18,340.59 = 7,321.74/x
3. Step 3: Cross multiply
   13,290.13x = 18,340.59 × 7,321.74
4. Step 4: Simplify right side
   13,290.13x = 134,285,031.43
5. Step 5: Solve for x
   x = 134,285,031.43/13,290.13
6. Step 6: Final answer
   x = 10,104.12