Finding the Fourth Proportional to 30,511.89, 42,105.83 and 19,881.45

Step by Step Solution

1. Step 1: Write the proportion equation
   30,511.89 : 42,105.83 = 19,881.45 : x
2. Step 2: Convert to fraction form
   30,511.89/42,105.83 = 19,881.45/x
3. Step 3: Cross multiply
   30,511.89x = 42,105.83 × 19,881.45
4. Step 4: Simplify right side
   30,511.89x = 837,124,854.45
5. Step 5: Solve for x
   x = 837,124,854.45/30,511.89
6. Step 6: Final answer
   x = 27,436.02