Finding the Fourth Proportional to 12,648.34, 18,979.80 and 5,253.04

Step by Step Solution

1. Step 1: Write the proportion equation
   12,648.34 : 18,979.80 = 5,253.04 : x
2. Step 2: Convert to fraction form
   12,648.34/18,979.80 = 5,253.04/x
3. Step 3: Cross multiply
   12,648.34x = 18,979.80 × 5,253.04
4. Step 4: Simplify right side
   12,648.34x = 99,701,648.59
5. Step 5: Solve for x
   x = 99,701,648.59/12,648.34
6. Step 6: Final answer
   x = 7,882.59