Finding the Fourth Proportional to 12,928.34, 19,392.57 and 5,137.17

Step by Step Solution

1. Step 1: Write the proportion equation
   12,928.34 : 19,392.57 = 5,137.17 : x
2. Step 2: Convert to fraction form
   12,928.34/19,392.57 = 5,137.17/x
3. Step 3: Cross multiply
   12,928.34x = 19,392.57 × 5,137.17
4. Step 4: Simplify right side
   12,928.34x = 99,622,928.83
5. Step 5: Solve for x
   x = 99,622,928.83/12,928.34
6. Step 6: Final answer
   x = 7,705.78