Finding the Fourth Proportional to 12,936, 19,406.34 and 8,557.08

Step by Step Solution

1. Step 1: Write the proportion equation
   12,936 : 19,406.34 = 8,557.08 : x
2. Step 2: Convert to fraction form
   12,936/19,406.34 = 8,557.08/x
3. Step 3: Cross multiply
   12,936x = 19,406.34 × 8,557.08
4. Step 4: Simplify right side
   12,936x = 166,061,603.89
5. Step 5: Solve for x
   x = 166,061,603.89/12,936
6. Step 6: Final answer
   x = 12,837.17