Finding the Fourth Proportional to 25,943.10, 38,910.78 and 7,221.18

Step by Step Solution

1. Step 1: Write the proportion equation
   25,943.10 : 38,910.78 = 7,221.18 : x
2. Step 2: Convert to fraction form
   25,943.10/38,910.78 = 7,221.18/x
3. Step 3: Cross multiply
   25,943.10x = 38,910.78 × 7,221.18
4. Step 4: Simplify right side
   25,943.10x = 280,981,746.32
5. Step 5: Solve for x
   x = 280,981,746.32/25,943.10
6. Step 6: Final answer
   x = 10,830.69