Finding the Fourth Proportional to 30,880.79, 42,615.82 and 18,134.12

Step by Step Solution

1. Step 1: Write the proportion equation
   30,880.79 : 42,615.82 = 18,134.12 : x
2. Step 2: Convert to fraction form
   30,880.79/42,615.82 = 18,134.12/x
3. Step 3: Cross multiply
   30,880.79x = 42,615.82 × 18,134.12
4. Step 4: Simplify right side
   30,880.79x = 772,800,393.78
5. Step 5: Solve for x
   x = 772,800,393.78/30,880.79
6. Step 6: Final answer
   x = 25,025.28