Finding the Fourth Proportional to 19,513, 26,939.55 and 12,810.36

Step by Step Solution

1. Step 1: Write the proportion equation
   19,513 : 26,939.55 = 12,810.36 : x
2. Step 2: Convert to fraction form
   19,513/26,939.55 = 12,810.36/x
3. Step 3: Cross multiply
   19,513x = 26,939.55 × 12,810.36
4. Step 4: Simplify right side
   19,513x = 345,105,333.74
5. Step 5: Solve for x
   x = 345,105,333.74/19,513
6. Step 6: Final answer
   x = 17,685.92