Finding the Fourth Proportional to 12,946.82, 19,439.68 and 7,406.42

Step by Step Solution

1. Step 1: Write the proportion equation
   12,946.82 : 19,439.68 = 7,406.42 : x
2. Step 2: Convert to fraction form
   12,946.82/19,439.68 = 7,406.42/x
3. Step 3: Cross multiply
   12,946.82x = 19,439.68 × 7,406.42
4. Step 4: Simplify right side
   12,946.82x = 143,978,434.75
5. Step 5: Solve for x
   x = 143,978,434.75/12,946.82
6. Step 6: Final answer
   x = 11,120.76