Finding the Fourth Proportional to 12,945.02, 17,866.06 and 7,912.16

Step by Step Solution

1. Step 1: Write the proportion equation
   12,945.02 : 17,866.06 = 7,912.16 : x
2. Step 2: Convert to fraction form
   12,945.02/17,866.06 = 7,912.16/x
3. Step 3: Cross multiply
   12,945.02x = 17,866.06 × 7,912.16
4. Step 4: Simplify right side
   12,945.02x = 141,359,125.29
5. Step 5: Solve for x
   x = 141,359,125.29/12,945.02
6. Step 6: Final answer
   x = 10,919.96