Finding the Fourth Proportional to 30,160, 41,620.71 and 18,221.10

Step by Step Solution

1. Step 1: Write the proportion equation
   30,160 : 41,620.71 = 18,221.10 : x
2. Step 2: Convert to fraction form
   30,160/41,620.71 = 18,221.10/x
3. Step 3: Cross multiply
   30,160x = 41,620.71 × 18,221.10
4. Step 4: Simplify right side
   30,160x = 758,375,118.98
5. Step 5: Solve for x
   x = 758,375,118.98/30,160
6. Step 6: Final answer
   x = 25,145.06