Finding the Fourth Proportional to 12,950.74, 19,435.56 and 5,161.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,950.74 : 19,435.56 = 5,161.78 : x
2. Step 2: Convert to fraction form
   12,950.74/19,435.56 = 5,161.78/x
3. Step 3: Cross multiply
   12,950.74x = 19,435.56 × 5,161.78
4. Step 4: Simplify right side
   12,950.74x = 100,322,084.90
5. Step 5: Solve for x
   x = 100,322,084.90/12,950.74
6. Step 6: Final answer
   x = 7,746.44