Finding the Fourth Proportional to 30,991, 42,766.76 and 17,561.92

Step by Step Solution

1. Step 1: Write the proportion equation
   30,991 : 42,766.76 = 17,561.92 : x
2. Step 2: Convert to fraction form
   30,991/42,766.76 = 17,561.92/x
3. Step 3: Cross multiply
   30,991x = 42,766.76 × 17,561.92
4. Step 4: Simplify right side
   30,991x = 751,066,417.78
5. Step 5: Solve for x
   x = 751,066,417.78/30,991
6. Step 6: Final answer
   x = 24,234.98