Finding the Fourth Proportional to 12,936.19, 19,407.86 and 5,150.47

Step by Step Solution

1. Step 1: Write the proportion equation
   12,936.19 : 19,407.86 = 5,150.47 : x
2. Step 2: Convert to fraction form
   12,936.19/19,407.86 = 5,150.47/x
3. Step 3: Cross multiply
   12,936.19x = 19,407.86 × 5,150.47
4. Step 4: Simplify right side
   12,936.19x = 99,959,574.94
5. Step 5: Solve for x
   x = 99,959,574.94/12,936.19
6. Step 6: Final answer
   x = 7,727.13