Finding the Fourth Proportional to 12,890.24, 19,308.50 and 10,377.89

Step by Step Solution

1. Step 1: Write the proportion equation
   12,890.24 : 19,308.50 = 10,377.89 : x
2. Step 2: Convert to fraction form
   12,890.24/19,308.50 = 10,377.89/x
3. Step 3: Cross multiply
   12,890.24x = 19,308.50 × 10,377.89
4. Step 4: Simplify right side
   12,890.24x = 200,381,437.18
5. Step 5: Solve for x
   x = 200,381,437.18/12,890.24
6. Step 6: Final answer
   x = 15,545.21