Finding the Fourth Proportional to 12,638.69, 18,958.49 and 4,740.40

Step by Step Solution

1. Step 1: Write the proportion equation
   12,638.69 : 18,958.49 = 4,740.40 : x
2. Step 2: Convert to fraction form
   12,638.69/18,958.49 = 4,740.40/x
3. Step 3: Cross multiply
   12,638.69x = 18,958.49 × 4,740.40
4. Step 4: Simplify right side
   12,638.69x = 89,870,826.00
5. Step 5: Solve for x
   x = 89,870,826.00/12,638.69
6. Step 6: Final answer
   x = 7,110.77