Finding the Fourth Proportional to 25,406.78, 38,117.86 and 7,876.76

Step by Step Solution

1. Step 1: Write the proportion equation
   25,406.78 : 38,117.86 = 7,876.76 : x
2. Step 2: Convert to fraction form
   25,406.78/38,117.86 = 7,876.76/x
3. Step 3: Cross multiply
   25,406.78x = 38,117.86 × 7,876.76
4. Step 4: Simplify right side
   25,406.78x = 300,245,024.65
5. Step 5: Solve for x
   x = 300,245,024.65/25,406.78
6. Step 6: Final answer
   x = 11,817.52