Finding the Fourth Proportional to 17,816.71, 26,734.28 and 12,926.71

Step by Step Solution

1. Step 1: Write the proportion equation
   17,816.71 : 26,734.28 = 12,926.71 : x
2. Step 2: Convert to fraction form
   17,816.71/26,734.28 = 12,926.71/x
3. Step 3: Cross multiply
   17,816.71x = 26,734.28 × 12,926.71
4. Step 4: Simplify right side
   17,816.71x = 345,586,086.31
5. Step 5: Solve for x
   x = 345,586,086.31/17,816.71
6. Step 6: Final answer
   x = 19,396.75