Finding the Fourth Proportional to 19,230.31, 26,518.39 and 12,856.83

Step by Step Solution

1. Step 1: Write the proportion equation
   19,230.31 : 26,518.39 = 12,856.83 : x
2. Step 2: Convert to fraction form
   19,230.31/26,518.39 = 12,856.83/x
3. Step 3: Cross multiply
   19,230.31x = 26,518.39 × 12,856.83
4. Step 4: Simplify right side
   19,230.31x = 340,942,300.52
5. Step 5: Solve for x
   x = 340,942,300.52/19,230.31
6. Step 6: Final answer
   x = 17,729.42