Finding the Fourth Proportional to 12,684.08, 18,998.42 and 7,738.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,684.08 : 18,998.42 = 7,738.72 : x
2. Step 2: Convert to fraction form
   12,684.08/18,998.42 = 7,738.72/x
3. Step 3: Cross multiply
   12,684.08x = 18,998.42 × 7,738.72
4. Step 4: Simplify right side
   12,684.08x = 147,023,452.82
5. Step 5: Solve for x
   x = 147,023,452.82/12,684.08
6. Step 6: Final answer
   x = 11,591.18