Finding the Fourth Proportional to 42,540.09, 63,819.36 and 12,957.15

Step by Step Solution

1. Step 1: Write the proportion equation
   42,540.09 : 63,819.36 = 12,957.15 : x
2. Step 2: Convert to fraction form
   42,540.09/63,819.36 = 12,957.15/x
3. Step 3: Cross multiply
   42,540.09x = 63,819.36 × 12,957.15
4. Step 4: Simplify right side
   42,540.09x = 826,917,020.42
5. Step 5: Solve for x
   x = 826,917,020.42/42,540.09
6. Step 6: Final answer
   x = 19,438.53