Finding the Fourth Proportional to 30,590.43, 42,212.37 and 18,488.46

Step by Step Solution

1. Step 1: Write the proportion equation
   30,590.43 : 42,212.37 = 18,488.46 : x
2. Step 2: Convert to fraction form
   30,590.43/42,212.37 = 18,488.46/x
3. Step 3: Cross multiply
   30,590.43x = 42,212.37 × 18,488.46
4. Step 4: Simplify right side
   30,590.43x = 780,441,941.88
5. Step 5: Solve for x
   x = 780,441,941.88/30,590.43
6. Step 6: Final answer
   x = 25,512.62