Finding the Fourth Proportional to 30,864.42, 42,590.69 and 18,118.12

Step by Step Solution

1. Step 1: Write the proportion equation
   30,864.42 : 42,590.69 = 18,118.12 : x
2. Step 2: Convert to fraction form
   30,864.42/42,590.69 = 18,118.12/x
3. Step 3: Cross multiply
   30,864.42x = 42,590.69 × 18,118.12
4. Step 4: Simplify right side
   30,864.42x = 771,663,072.19
5. Step 5: Solve for x
   x = 771,663,072.19/30,864.42
6. Step 6: Final answer
   x = 25,001.71