Finding the Fourth Proportional to 19,935.81, 27,510.71 and 12,869.37

Step by Step Solution

1. Step 1: Write the proportion equation
   19,935.81 : 27,510.71 = 12,869.37 : x
2. Step 2: Convert to fraction form
   19,935.81/27,510.71 = 12,869.37/x
3. Step 3: Cross multiply
   19,935.81x = 27,510.71 × 12,869.37
4. Step 4: Simplify right side
   19,935.81x = 354,045,441.61
5. Step 5: Solve for x
   x = 354,045,441.61/19,935.81
6. Step 6: Final answer
   x = 17,759.27