Finding the Fourth Proportional to 30,985.47, 42,744.92 and 18,401.31

Step by Step Solution

1. Step 1: Write the proportion equation
   30,985.47 : 42,744.92 = 18,401.31 : x
2. Step 2: Convert to fraction form
   30,985.47/42,744.92 = 18,401.31/x
3. Step 3: Cross multiply
   30,985.47x = 42,744.92 × 18,401.31
4. Step 4: Simplify right side
   30,985.47x = 786,562,431.84
5. Step 5: Solve for x
   x = 786,562,431.84/30,985.47
6. Step 6: Final answer
   x = 25,384.88