Finding the Fourth Proportional to 30,890.57, 42,633.53 and 19,561.10

Step by Step Solution

1. Step 1: Write the proportion equation
   30,890.57 : 42,633.53 = 19,561.10 : x
2. Step 2: Convert to fraction form
   30,890.57/42,633.53 = 19,561.10/x
3. Step 3: Cross multiply
   30,890.57x = 42,633.53 × 19,561.10
4. Step 4: Simplify right side
   30,890.57x = 833,958,579.42
5. Step 5: Solve for x
   x = 833,958,579.42/30,890.57
6. Step 6: Final answer
   x = 26,997.19