Finding the Fourth Proportional to 21,191.56, 31,752.78 and 10,789

Step by Step Solution

1. Step 1: Write the proportion equation
   21,191.56 : 31,752.78 = 10,789 : x
2. Step 2: Convert to fraction form
   21,191.56/31,752.78 = 10,789/x
3. Step 3: Cross multiply
   21,191.56x = 31,752.78 × 10,789
4. Step 4: Simplify right side
   21,191.56x = 342,580,743.42
5. Step 5: Solve for x
   x = 342,580,743.42/21,191.56
6. Step 6: Final answer
   x = 16,165.90