Finding the Fourth Proportional to 12,781.36, 17,645.20 and 8,964.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,781.36 : 17,645.20 = 8,964.72 : x
2. Step 2: Convert to fraction form
   12,781.36/17,645.20 = 8,964.72/x
3. Step 3: Cross multiply
   12,781.36x = 17,645.20 × 8,964.72
4. Step 4: Simplify right side
   12,781.36x = 158,184,277.34
5. Step 5: Solve for x
   x = 158,184,277.34/12,781.36
6. Step 6: Final answer
   x = 12,376.17