Finding the Fourth Proportional to 20,385.42, 30,536.37 and 12,040.17

Step by Step Solution

1. Step 1: Write the proportion equation
   20,385.42 : 30,536.37 = 12,040.17 : x
2. Step 2: Convert to fraction form
   20,385.42/30,536.37 = 12,040.17/x
3. Step 3: Cross multiply
   20,385.42x = 30,536.37 × 12,040.17
4. Step 4: Simplify right side
   20,385.42x = 367,663,085.98
5. Step 5: Solve for x
   x = 367,663,085.98/20,385.42
6. Step 6: Final answer
   x = 18,035.59