Finding the Fourth Proportional to 19,105.42, 28,665.69 and 7,421.98

Step by Step Solution

1. Step 1: Write the proportion equation
   19,105.42 : 28,665.69 = 7,421.98 : x
2. Step 2: Convert to fraction form
   19,105.42/28,665.69 = 7,421.98/x
3. Step 3: Cross multiply
   19,105.42x = 28,665.69 × 7,421.98
4. Step 4: Simplify right side
   19,105.42x = 212,756,177.87
5. Step 5: Solve for x
   x = 212,756,177.87/19,105.42
6. Step 6: Final answer
   x = 11,135.91