Finding the Fourth Proportional to 12,644.96, 18,956.72 and 5,244.80

Step by Step Solution

1. Step 1: Write the proportion equation
   12,644.96 : 18,956.72 = 5,244.80 : x
2. Step 2: Convert to fraction form
   12,644.96/18,956.72 = 5,244.80/x
3. Step 3: Cross multiply
   12,644.96x = 18,956.72 × 5,244.80
4. Step 4: Simplify right side
   12,644.96x = 99,424,123.38
5. Step 5: Solve for x
   x = 99,424,123.38/12,644.96
6. Step 6: Final answer
   x = 7,862.75