Finding the Fourth Proportional to 13,086.77, 18,060.57 and 7,421.49

Step by Step Solution

1. Step 1: Write the proportion equation
   13,086.77 : 18,060.57 = 7,421.49 : x
2. Step 2: Convert to fraction form
   13,086.77/18,060.57 = 7,421.49/x
3. Step 3: Cross multiply
   13,086.77x = 18,060.57 × 7,421.49
4. Step 4: Simplify right side
   13,086.77x = 134,036,339.65
5. Step 5: Solve for x
   x = 134,036,339.65/13,086.77
6. Step 6: Final answer
   x = 10,242.13