Finding the Fourth Proportional to 10,120.48, 13,960.24 and 7,878.80

Step by Step Solution

1. Step 1: Write the proportion equation
   10,120.48 : 13,960.24 = 7,878.80 : x
2. Step 2: Convert to fraction form
   10,120.48/13,960.24 = 7,878.80/x
3. Step 3: Cross multiply
   10,120.48x = 13,960.24 × 7,878.80
4. Step 4: Simplify right side
   10,120.48x = 109,989,938.91
5. Step 5: Solve for x
   x = 109,989,938.91/10,120.48
6. Step 6: Final answer
   x = 10,868.06