Finding the Fourth Proportional to 30,131.42, 45,180.18 and 12,357.18

Step by Step Solution

1. Step 1: Write the proportion equation
   30,131.42 : 45,180.18 = 12,357.18 : x
2. Step 2: Convert to fraction form
   30,131.42/45,180.18 = 12,357.18/x
3. Step 3: Cross multiply
   30,131.42x = 45,180.18 × 12,357.18
4. Step 4: Simplify right side
   30,131.42x = 558,299,616.69
5. Step 5: Solve for x
   x = 558,299,616.69/30,131.42
6. Step 6: Final answer
   x = 18,528.82