Finding the Fourth Proportional to 21,057.86, 31,586.82 and 5,475.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,057.86 : 31,586.82 = 5,475.50 : x
2. Step 2: Convert to fraction form
   21,057.86/31,586.82 = 5,475.50/x
3. Step 3: Cross multiply
   21,057.86x = 31,586.82 × 5,475.50
4. Step 4: Simplify right side
   21,057.86x = 172,953,632.91
5. Step 5: Solve for x
   x = 172,953,632.91/21,057.86
6. Step 6: Final answer
   x = 8,213.26