Finding the Fourth Proportional to 12,978.24, 17,903.04 and 7,944.90

Step by Step Solution

1. Step 1: Write the proportion equation
   12,978.24 : 17,903.04 = 7,944.90 : x
2. Step 2: Convert to fraction form
   12,978.24/17,903.04 = 7,944.90/x
3. Step 3: Cross multiply
   12,978.24x = 17,903.04 × 7,944.90
4. Step 4: Simplify right side
   12,978.24x = 142,237,862.50
5. Step 5: Solve for x
   x = 142,237,862.50/12,978.24
6. Step 6: Final answer
   x = 10,959.72