Finding the Fourth Proportional to 10,308.72, 14,219.64 and 9,048.78

Step by Step Solution

1. Step 1: Write the proportion equation
   10,308.72 : 14,219.64 = 9,048.78 : x
2. Step 2: Convert to fraction form
   10,308.72/14,219.64 = 9,048.78/x
3. Step 3: Cross multiply
   10,308.72x = 14,219.64 × 9,048.78
4. Step 4: Simplify right side
   10,308.72x = 128,670,394.04
5. Step 5: Solve for x
   x = 128,670,394.04/10,308.72
6. Step 6: Final answer
   x = 12,481.70