Finding the Fourth Proportional to 12,478.86, 18,713.12 and 5,078.29

Step by Step Solution

1. Step 1: Write the proportion equation
   12,478.86 : 18,713.12 = 5,078.29 : x
2. Step 2: Convert to fraction form
   12,478.86/18,713.12 = 5,078.29/x
3. Step 3: Cross multiply
   12,478.86x = 18,713.12 × 5,078.29
4. Step 4: Simplify right side
   12,478.86x = 95,030,624.77
5. Step 5: Solve for x
   x = 95,030,624.77/12,478.86
6. Step 6: Final answer
   x = 7,615.33