Finding the Fourth Proportional to 12,946.69, 19,439.48 and 7,406.29

Step by Step Solution

1. Step 1: Write the proportion equation
   12,946.69 : 19,439.48 = 7,406.29 : x
2. Step 2: Convert to fraction form
   12,946.69/19,439.48 = 7,406.29/x
3. Step 3: Cross multiply
   12,946.69x = 19,439.48 × 7,406.29
4. Step 4: Simplify right side
   12,946.69x = 143,974,426.33
5. Step 5: Solve for x
   x = 143,974,426.33/12,946.69
6. Step 6: Final answer
   x = 11,120.56