Finding the Fourth Proportional to 12,488.96, 18,600.93 and 12,428.61

Step by Step Solution

1. Step 1: Write the proportion equation
   12,488.96 : 18,600.93 = 12,428.61 : x
2. Step 2: Convert to fraction form
   12,488.96/18,600.93 = 12,428.61/x
3. Step 3: Cross multiply
   12,488.96x = 18,600.93 × 12,428.61
4. Step 4: Simplify right side
   12,488.96x = 231,183,634.85
5. Step 5: Solve for x
   x = 231,183,634.85/12,488.96
6. Step 6: Final answer
   x = 18,511.04