Finding the Fourth Proportional to 30,435.21, 42,007.61 and 19,806.39

Step by Step Solution

1. Step 1: Write the proportion equation
   30,435.21 : 42,007.61 = 19,806.39 : x
2. Step 2: Convert to fraction form
   30,435.21/42,007.61 = 19,806.39/x
3. Step 3: Cross multiply
   30,435.21x = 42,007.61 × 19,806.39
4. Step 4: Simplify right side
   30,435.21x = 832,019,007.60
5. Step 5: Solve for x
   x = 832,019,007.60/30,435.21
6. Step 6: Final answer
   x = 27,337.38