Finding the Fourth Proportional to 30,625.62, 42,260.31 and 18,691.89

Step by Step Solution

1. Step 1: Write the proportion equation
   30,625.62 : 42,260.31 = 18,691.89 : x
2. Step 2: Convert to fraction form
   30,625.62/42,260.31 = 18,691.89/x
3. Step 3: Cross multiply
   30,625.62x = 42,260.31 × 18,691.89
4. Step 4: Simplify right side
   30,625.62x = 789,925,065.89
5. Step 5: Solve for x
   x = 789,925,065.89/30,625.62
6. Step 6: Final answer
   x = 25,792.95