Finding the Fourth Proportional to 30,665.73, 42,326.15 and 18,739.11

Step by Step Solution

1. Step 1: Write the proportion equation
   30,665.73 : 42,326.15 = 18,739.11 : x
2. Step 2: Convert to fraction form
   30,665.73/42,326.15 = 18,739.11/x
3. Step 3: Cross multiply
   30,665.73x = 42,326.15 × 18,739.11
4. Step 4: Simplify right side
   30,665.73x = 793,154,215.94
5. Step 5: Solve for x
   x = 793,154,215.94/30,665.73
6. Step 6: Final answer
   x = 25,864.52