Finding the Fourth Proportional to 12,881.37, 17,776.53 and 7,845.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,881.37 : 17,776.53 = 7,845.78 : x
2. Step 2: Convert to fraction form
   12,881.37/17,776.53 = 7,845.78/x
3. Step 3: Cross multiply
   12,881.37x = 17,776.53 × 7,845.78
4. Step 4: Simplify right side
   12,881.37x = 139,470,743.54
5. Step 5: Solve for x
   x = 139,470,743.54/12,881.37
6. Step 6: Final answer
   x = 10,827.32