Finding the Fourth Proportional to 21,087.04, 29,100.72 and 11,656.48

Step by Step Solution

1. Step 1: Write the proportion equation
   21,087.04 : 29,100.72 = 11,656.48 : x
2. Step 2: Convert to fraction form
   21,087.04/29,100.72 = 11,656.48/x
3. Step 3: Cross multiply
   21,087.04x = 29,100.72 × 11,656.48
4. Step 4: Simplify right side
   21,087.04x = 339,211,960.67
5. Step 5: Solve for x
   x = 339,211,960.67/21,087.04
6. Step 6: Final answer
   x = 16,086.28