Finding the Fourth Proportional to 30,872.64, 42,604.56 and 18,294.72

Step by Step Solution

1. Step 1: Write the proportion equation
   30,872.64 : 42,604.56 = 18,294.72 : x
2. Step 2: Convert to fraction form
   30,872.64/42,604.56 = 18,294.72/x
3. Step 3: Cross multiply
   30,872.64x = 42,604.56 × 18,294.72
4. Step 4: Simplify right side
   30,872.64x = 779,438,495.92
5. Step 5: Solve for x
   x = 779,438,495.92/30,872.64
6. Step 6: Final answer
   x = 25,246.90