Finding the Fourth Proportional to 12,936.32, 19,414.56 and 9,015.20

Step by Step Solution

1. Step 1: Write the proportion equation
   12,936.32 : 19,414.56 = 9,015.20 : x
2. Step 2: Convert to fraction form
   12,936.32/19,414.56 = 9,015.20/x
3. Step 3: Cross multiply
   12,936.32x = 19,414.56 × 9,015.20
4. Step 4: Simplify right side
   12,936.32x = 175,026,141.31
5. Step 5: Solve for x
   x = 175,026,141.31/12,936.32
6. Step 6: Final answer
   x = 13,529.82