Finding the Fourth Proportional to 12,935.81, 19,290.50 and 12,817.57

Step by Step Solution

1. Step 1: Write the proportion equation
   12,935.81 : 19,290.50 = 12,817.57 : x
2. Step 2: Convert to fraction form
   12,935.81/19,290.50 = 12,817.57/x
3. Step 3: Cross multiply
   12,935.81x = 19,290.50 × 12,817.57
4. Step 4: Simplify right side
   12,935.81x = 247,257,334.09
5. Step 5: Solve for x
   x = 247,257,334.09/12,935.81
6. Step 6: Final answer
   x = 19,114.17