Finding the Fourth Proportional to 12,800.72, 17,663.72 and 9,445.36

Step by Step Solution

1. Step 1: Write the proportion equation
   12,800.72 : 17,663.72 = 9,445.36 : x
2. Step 2: Convert to fraction form
   12,800.72/17,663.72 = 9,445.36/x
3. Step 3: Cross multiply
   12,800.72x = 17,663.72 × 9,445.36
4. Step 4: Simplify right side
   12,800.72x = 166,840,194.34
5. Step 5: Solve for x
   x = 166,840,194.34/12,800.72
6. Step 6: Final answer
   x = 13,033.66