Finding the Fourth Proportional to 12,972.56, 17,903.48 and 7,940.12

Step by Step Solution

1. Step 1: Write the proportion equation
   12,972.56 : 17,903.48 = 7,940.12 : x
2. Step 2: Convert to fraction form
   12,972.56/17,903.48 = 7,940.12/x
3. Step 3: Cross multiply
   12,972.56x = 17,903.48 × 7,940.12
4. Step 4: Simplify right side
   12,972.56x = 142,155,650.40
5. Step 5: Solve for x
   x = 142,155,650.40/12,972.56
6. Step 6: Final answer
   x = 10,958.18