Finding the Fourth Proportional to 30,619.62, 42,252.03 and 18,685.89

Step by Step Solution

1. Step 1: Write the proportion equation
   30,619.62 : 42,252.03 = 18,685.89 : x
2. Step 2: Convert to fraction form
   30,619.62/42,252.03 = 18,685.89/x
3. Step 3: Cross multiply
   30,619.62x = 42,252.03 × 18,685.89
4. Step 4: Simplify right side
   30,619.62x = 789,516,784.86
5. Step 5: Solve for x
   x = 789,516,784.86/30,619.62
6. Step 6: Final answer
   x = 25,784.67