Finding the Fourth Proportional to 12,928.94, 19,422.57 and 7,738.46

Step by Step Solution

1. Step 1: Write the proportion equation
   12,928.94 : 19,422.57 = 7,738.46 : x
2. Step 2: Convert to fraction form
   12,928.94/19,422.57 = 7,738.46/x
3. Step 3: Cross multiply
   12,928.94x = 19,422.57 × 7,738.46
4. Step 4: Simplify right side
   12,928.94x = 150,300,781.04
5. Step 5: Solve for x
   x = 150,300,781.04/12,928.94
6. Step 6: Final answer
   x = 11,625.14