Finding the Fourth Proportional to 30,890.94, 42,634.05 and 19,561.47

Step by Step Solution

1. Step 1: Write the proportion equation
   30,890.94 : 42,634.05 = 19,561.47 : x
2. Step 2: Convert to fraction form
   30,890.94/42,634.05 = 19,561.47/x
3. Step 3: Cross multiply
   30,890.94x = 42,634.05 × 19,561.47
4. Step 4: Simplify right side
   30,890.94x = 833,984,690.05
5. Step 5: Solve for x
   x = 833,984,690.05/30,890.94
6. Step 6: Final answer
   x = 26,997.71