Finding the Fourth Proportional to 12,963.69, 19,449.62 and 4,638.03

Step by Step Solution

1. Step 1: Write the proportion equation
   12,963.69 : 19,449.62 = 4,638.03 : x
2. Step 2: Convert to fraction form
   12,963.69/19,449.62 = 4,638.03/x
3. Step 3: Cross multiply
   12,963.69x = 19,449.62 × 4,638.03
4. Step 4: Simplify right side
   12,963.69x = 90,207,897.86
5. Step 5: Solve for x
   x = 90,207,897.86/12,963.69
6. Step 6: Final answer
   x = 6,958.50