Finding the Fourth Proportional to 13,186.72, 19,764.72 and 7,332.96

Step by Step Solution

1. Step 1: Write the proportion equation
   13,186.72 : 19,764.72 = 7,332.96 : x
2. Step 2: Convert to fraction form
   13,186.72/19,764.72 = 7,332.96/x
3. Step 3: Cross multiply
   13,186.72x = 19,764.72 × 7,332.96
4. Step 4: Simplify right side
   13,186.72x = 144,933,901.17
5. Step 5: Solve for x
   x = 144,933,901.17/13,186.72
6. Step 6: Final answer
   x = 10,990.90