Finding the Fourth Proportional to 13,372.72, 18,456.12 and 7,707.28

Step by Step Solution

1. Step 1: Write the proportion equation
   13,372.72 : 18,456.12 = 7,707.28 : x
2. Step 2: Convert to fraction form
   13,372.72/18,456.12 = 7,707.28/x
3. Step 3: Cross multiply
   13,372.72x = 18,456.12 × 7,707.28
4. Step 4: Simplify right side
   13,372.72x = 142,246,484.55
5. Step 5: Solve for x
   x = 142,246,484.55/13,372.72
6. Step 6: Final answer
   x = 10,637.06