Finding the Fourth Proportional to 11,199.89, 15,456.60 and 7,416.50

Step by Step Solution

1. Step 1: Write the proportion equation
   11,199.89 : 15,456.60 = 7,416.50 : x
2. Step 2: Convert to fraction form
   11,199.89/15,456.60 = 7,416.50/x
3. Step 3: Cross multiply
   11,199.89x = 15,456.60 × 7,416.50
4. Step 4: Simplify right side
   11,199.89x = 114,633,796.62
5. Step 5: Solve for x
   x = 114,633,796.62/11,199.89
6. Step 6: Final answer
   x = 10,235.26