Finding the Fourth Proportional to 12,945.14, 17,863.72 and 7,917.80

Step by Step Solution

1. Step 1: Write the proportion equation
   12,945.14 : 17,863.72 = 7,917.80 : x
2. Step 2: Convert to fraction form
   12,945.14/17,863.72 = 7,917.80/x
3. Step 3: Cross multiply
   12,945.14x = 17,863.72 × 7,917.80
4. Step 4: Simplify right side
   12,945.14x = 141,441,362.22
5. Step 5: Solve for x
   x = 141,441,362.22/12,945.14
6. Step 6: Final answer
   x = 10,926.21