Finding the Fourth Proportional to 28,340.48, 42,479.59 and 11,691.49

Step by Step Solution

1. Step 1: Write the proportion equation
   28,340.48 : 42,479.59 = 11,691.49 : x
2. Step 2: Convert to fraction form
   28,340.48/42,479.59 = 11,691.49/x
3. Step 3: Cross multiply
   28,340.48x = 42,479.59 × 11,691.49
4. Step 4: Simplify right side
   28,340.48x = 496,649,667.83
5. Step 5: Solve for x
   x = 496,649,667.83/28,340.48
6. Step 6: Final answer
   x = 17,524.39