Finding the Fourth Proportional to 30,581.49, 42,201.50 and 18,640.47

Step by Step Solution

1. Step 1: Write the proportion equation
   30,581.49 : 42,201.50 = 18,640.47 : x
2. Step 2: Convert to fraction form
   30,581.49/42,201.50 = 18,640.47/x
3. Step 3: Cross multiply
   30,581.49x = 42,201.50 × 18,640.47
4. Step 4: Simplify right side
   30,581.49x = 786,655,701.50
5. Step 5: Solve for x
   x = 786,655,701.50/30,581.49
6. Step 6: Final answer
   x = 25,723.26