Finding the Fourth Proportional to 21,191.68, 31,791.57 and 10,103.59

Step by Step Solution

1. Step 1: Write the proportion equation
   21,191.68 : 31,791.57 = 10,103.59 : x
2. Step 2: Convert to fraction form
   21,191.68/31,791.57 = 10,103.59/x
3. Step 3: Cross multiply
   21,191.68x = 31,791.57 × 10,103.59
4. Step 4: Simplify right side
   21,191.68x = 321,208,988.74
5. Step 5: Solve for x
   x = 321,208,988.74/21,191.68
6. Step 6: Final answer
   x = 15,157.32