Finding the Fourth Proportional to 12,949.30, 19,411.15 and 5,147.70

Step by Step Solution

1. Step 1: Write the proportion equation
   12,949.30 : 19,411.15 = 5,147.70 : x
2. Step 2: Convert to fraction form
   12,949.30/19,411.15 = 5,147.70/x
3. Step 3: Cross multiply
   12,949.30x = 19,411.15 × 5,147.70
4. Step 4: Simplify right side
   12,949.30x = 99,922,776.86
5. Step 5: Solve for x
   x = 99,922,776.86/12,949.30
6. Step 6: Final answer
   x = 7,716.46