Finding the Fourth Proportional to 30,909.42, 42,656.22 and 18,162.72

Step by Step Solution

1. Step 1: Write the proportion equation
   30,909.42 : 42,656.22 = 18,162.72 : x
2. Step 2: Convert to fraction form
   30,909.42/42,656.22 = 18,162.72/x
3. Step 3: Cross multiply
   30,909.42x = 42,656.22 × 18,162.72
4. Step 4: Simplify right side
   30,909.42x = 774,752,980.12
5. Step 5: Solve for x
   x = 774,752,980.12/30,909.42
6. Step 6: Final answer
   x = 25,065.27