Finding the Fourth Proportional to 30,876, 42,618.60 and 19,698

Step by Step Solution

1. Step 1: Write the proportion equation
   30,876 : 42,618.60 = 19,698 : x
2. Step 2: Convert to fraction form
   30,876/42,618.60 = 19,698/x
3. Step 3: Cross multiply
   30,876x = 42,618.60 × 19,698
4. Step 4: Simplify right side
   30,876x = 839,501,182.80
5. Step 5: Solve for x
   x = 839,501,182.80/30,876
6. Step 6: Final answer
   x = 27,189.44