Finding the Fourth Proportional to 12,636.72, 18,957.78 and 4,847.76

Step by Step Solution

1. Step 1: Write the proportion equation
   12,636.72 : 18,957.78 = 4,847.76 : x
2. Step 2: Convert to fraction form
   12,636.72/18,957.78 = 4,847.76/x
3. Step 3: Cross multiply
   12,636.72x = 18,957.78 × 4,847.76
4. Step 4: Simplify right side
   12,636.72x = 91,902,767.57
5. Step 5: Solve for x
   x = 91,902,767.57/12,636.72
6. Step 6: Final answer
   x = 7,272.68