Finding the Fourth Proportional to 12,493.76, 17,238.57 and 7,458.80

Step by Step Solution

1. Step 1: Write the proportion equation
   12,493.76 : 17,238.57 = 7,458.80 : x
2. Step 2: Convert to fraction form
   12,493.76/17,238.57 = 7,458.80/x
3. Step 3: Cross multiply
   12,493.76x = 17,238.57 × 7,458.80
4. Step 4: Simplify right side
   12,493.76x = 128,579,045.92
5. Step 5: Solve for x
   x = 128,579,045.92/12,493.76
6. Step 6: Final answer
   x = 10,291.46