Finding the Fourth Proportional to 30,966.98, 42,738.06 and 18,391.72

Step by Step Solution

1. Step 1: Write the proportion equation
   30,966.98 : 42,738.06 = 18,391.72 : x
2. Step 2: Convert to fraction form
   30,966.98/42,738.06 = 18,391.72/x
3. Step 3: Cross multiply
   30,966.98x = 42,738.06 × 18,391.72
4. Step 4: Simplify right side
   30,966.98x = 786,026,432.86
5. Step 5: Solve for x
   x = 786,026,432.86/30,966.98
6. Step 6: Final answer
   x = 25,382.73