Finding the Fourth Proportional to 19,111.33, 28,659.72 and 7,421.83

Step by Step Solution

1. Step 1: Write the proportion equation
   19,111.33 : 28,659.72 = 7,421.83 : x
2. Step 2: Convert to fraction form
   19,111.33/28,659.72 = 7,421.83/x
3. Step 3: Cross multiply
   19,111.33x = 28,659.72 × 7,421.83
4. Step 4: Simplify right side
   19,111.33x = 212,707,569.69
5. Step 5: Solve for x
   x = 212,707,569.69/19,111.33
6. Step 6: Final answer
   x = 11,129.92