Finding the Fourth Proportional to 12,712.86, 19,074.78 and 7,518.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,712.86 : 19,074.78 = 7,518.78 : x
2. Step 2: Convert to fraction form
   12,712.86/19,074.78 = 7,518.78/x
3. Step 3: Cross multiply
   12,712.86x = 19,074.78 × 7,518.78
4. Step 4: Simplify right side
   12,712.86x = 143,419,074.37
5. Step 5: Solve for x
   x = 143,419,074.37/12,712.86
6. Step 6: Final answer
   x = 11,281.42