Finding the Fourth Proportional to 12,770.72, 17,632.32 and 9,781.28

Step by Step Solution

1. Step 1: Write the proportion equation
   12,770.72 : 17,632.32 = 9,781.28 : x
2. Step 2: Convert to fraction form
   12,770.72/17,632.32 = 9,781.28/x
3. Step 3: Cross multiply
   12,770.72x = 17,632.32 × 9,781.28
4. Step 4: Simplify right side
   12,770.72x = 172,466,658.97
5. Step 5: Solve for x
   x = 172,466,658.97/12,770.72
6. Step 6: Final answer
   x = 13,504.85