Finding the Fourth Proportional to 30,972.15, 42,741.72 and 18,225.81

Step by Step Solution

1. Step 1: Write the proportion equation
   30,972.15 : 42,741.72 = 18,225.81 : x
2. Step 2: Convert to fraction form
   30,972.15/42,741.72 = 18,225.81/x
3. Step 3: Cross multiply
   30,972.15x = 42,741.72 × 18,225.81
4. Step 4: Simplify right side
   30,972.15x = 779,002,467.79
5. Step 5: Solve for x
   x = 779,002,467.79/30,972.15
6. Step 6: Final answer
   x = 25,151.71