Finding the Fourth Proportional to 25,910.69, 38,864.86 and 8,140.91

Step by Step Solution

1. Step 1: Write the proportion equation
   25,910.69 : 38,864.86 = 8,140.91 : x
2. Step 2: Convert to fraction form
   25,910.69/38,864.86 = 8,140.91/x
3. Step 3: Cross multiply
   25,910.69x = 38,864.86 × 8,140.91
4. Step 4: Simplify right side
   25,910.69x = 316,395,158.54
5. Step 5: Solve for x
   x = 316,395,158.54/25,910.69
6. Step 6: Final answer
   x = 12,210.99