Finding the Fourth Proportional to 30,986.73, 42,737.82 and 20,899.19

Step by Step Solution

1. Step 1: Write the proportion equation
   30,986.73 : 42,737.82 = 20,899.19 : x
2. Step 2: Convert to fraction form
   30,986.73/42,737.82 = 20,899.19/x
3. Step 3: Cross multiply
   30,986.73x = 42,737.82 × 20,899.19
4. Step 4: Simplify right side
   30,986.73x = 893,185,820.37
5. Step 5: Solve for x
   x = 893,185,820.37/30,986.73
6. Step 6: Final answer
   x = 28,824.78