Finding the Fourth Proportional to 13,428.72, 18,530.28 and 7,842.96

Step by Step Solution

1. Step 1: Write the proportion equation
   13,428.72 : 18,530.28 = 7,842.96 : x
2. Step 2: Convert to fraction form
   13,428.72/18,530.28 = 7,842.96/x
3. Step 3: Cross multiply
   13,428.72x = 18,530.28 × 7,842.96
4. Step 4: Simplify right side
   13,428.72x = 145,332,244.83
5. Step 5: Solve for x
   x = 145,332,244.83/13,428.72
6. Step 6: Final answer
   x = 10,822.49