Finding the Fourth Proportional to 30,890.81, 42,633.87 and 19,561.34

Step by Step Solution

1. Step 1: Write the proportion equation
   30,890.81 : 42,633.87 = 19,561.34 : x
2. Step 2: Convert to fraction form
   30,890.81/42,633.87 = 19,561.34/x
3. Step 3: Cross multiply
   30,890.81x = 42,633.87 × 19,561.34
4. Step 4: Simplify right side
   30,890.81x = 833,975,626.59
5. Step 5: Solve for x
   x = 833,975,626.59/30,890.81
6. Step 6: Final answer
   x = 26,997.53