Finding the Fourth Proportional to 21,791.24, 30,070.96 and 12,100.09

Step by Step Solution

1. Step 1: Write the proportion equation
   21,791.24 : 30,070.96 = 12,100.09 : x
2. Step 2: Convert to fraction form
   21,791.24/30,070.96 = 12,100.09/x
3. Step 3: Cross multiply
   21,791.24x = 30,070.96 × 12,100.09
4. Step 4: Simplify right side
   21,791.24x = 363,861,261.89
5. Step 5: Solve for x
   x = 363,861,261.89/21,791.24
6. Step 6: Final answer
   x = 16,697.60