Finding the Fourth Proportional to 19,146.43, 28,733.69 and 12,570.31

Step by Step Solution

1. Step 1: Write the proportion equation
   19,146.43 : 28,733.69 = 12,570.31 : x
2. Step 2: Convert to fraction form
   19,146.43/28,733.69 = 12,570.31/x
3. Step 3: Cross multiply
   19,146.43x = 28,733.69 × 12,570.31
4. Step 4: Simplify right side
   19,146.43x = 361,191,390.74
5. Step 5: Solve for x
   x = 361,191,390.74/19,146.43
6. Step 6: Final answer
   x = 18,864.69