Finding the Fourth Proportional to 11,991.48, 16,538.94 and 10,648.50

Step by Step Solution

1. Step 1: Write the proportion equation
   11,991.48 : 16,538.94 = 10,648.50 : x
2. Step 2: Convert to fraction form
   11,991.48/16,538.94 = 10,648.50/x
3. Step 3: Cross multiply
   11,991.48x = 16,538.94 × 10,648.50
4. Step 4: Simplify right side
   11,991.48x = 176,114,902.59
5. Step 5: Solve for x
   x = 176,114,902.59/11,991.48
6. Step 6: Final answer
   x = 14,686.67