Finding the Fourth Proportional to 30,651.21, 42,326.33 and 19,340.78

Step by Step Solution

1. Step 1: Write the proportion equation
   30,651.21 : 42,326.33 = 19,340.78 : x
2. Step 2: Convert to fraction form
   30,651.21/42,326.33 = 19,340.78/x
3. Step 3: Cross multiply
   30,651.21x = 42,326.33 × 19,340.78
4. Step 4: Simplify right side
   30,651.21x = 818,623,928.40
5. Step 5: Solve for x
   x = 818,623,928.40/30,651.21
6. Step 6: Final answer
   x = 26,707.72