Finding the Fourth Proportional to 12,961.67, 19,424.27 and 7,406.69

Step by Step Solution

1. Step 1: Write the proportion equation
   12,961.67 : 19,424.27 = 7,406.69 : x
2. Step 2: Convert to fraction form
   12,961.67/19,424.27 = 7,406.69/x
3. Step 3: Cross multiply
   12,961.67x = 19,424.27 × 7,406.69
4. Step 4: Simplify right side
   12,961.67x = 143,869,467.76
5. Step 5: Solve for x
   x = 143,869,467.76/12,961.67
6. Step 6: Final answer
   x = 11,099.61