Finding the Fourth Proportional to 30,890.56, 42,633.53 and 19,561.09

Step by Step Solution

1. Step 1: Write the proportion equation
   30,890.56 : 42,633.53 = 19,561.09 : x
2. Step 2: Convert to fraction form
   30,890.56/42,633.53 = 19,561.09/x
3. Step 3: Cross multiply
   30,890.56x = 42,633.53 × 19,561.09
4. Step 4: Simplify right side
   30,890.56x = 833,958,346.19
5. Step 5: Solve for x
   x = 833,958,346.19/30,890.56
6. Step 6: Final answer
   x = 26,997.19