Finding the Fourth Proportional to 38,964.69, 58,434.03 and 12,663

Step by Step Solution

1. Step 1: Write the proportion equation
   38,964.69 : 58,434.03 = 12,663 : x
2. Step 2: Convert to fraction form
   38,964.69/58,434.03 = 12,663/x
3. Step 3: Cross multiply
   38,964.69x = 58,434.03 × 12,663
4. Step 4: Simplify right side
   38,964.69x = 739,950,121.89
5. Step 5: Solve for x
   x = 739,950,121.89/38,964.69
6. Step 6: Final answer
   x = 18,990.27