Finding the Fourth Proportional to 10,078.50, 15,116.10 and 7,147.92

Step by Step Solution

1. Step 1: Write the proportion equation
   10,078.50 : 15,116.10 = 7,147.92 : x
2. Step 2: Convert to fraction form
   10,078.50/15,116.10 = 7,147.92/x
3. Step 3: Cross multiply
   10,078.50x = 15,116.10 × 7,147.92
4. Step 4: Simplify right side
   10,078.50x = 108,048,673.51
5. Step 5: Solve for x
   x = 108,048,673.51/10,078.50
6. Step 6: Final answer
   x = 10,720.71